By default, the browser does not resize the background image.
However, what if you need to set the background to a different width and height
or bind its dimensions to the dimensions of the parent block?
You can do this using the background-size property. It takes two arguments as a value: the first is the width of the background image,
and the second is its height. The second argument is optional. If the height is not specified, then it is determined automatically depending on the width and original proportions.
By default, both arguments are auto.
Example:
background-size: auto auto; /* Original image width and height */
background-size: 100px; /* Width of 100px, proportional height */
background-size: 100px 200px; /* Width of 100px, height of 200px */
Let’s see how this property works in practice.
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</script><link rel="stylesheet" href="https://assets.htmlacademy.org/css/core.v284.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/profile.v236.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course.v246.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course-interface-light.v20.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course-interface-en.v2.css"><script src="https://assets.htmlacademy.org/js/sentry.js" data-sentry="3774884cc81746ed84c0ba7c5cd4ac7b" data-project="26" data-version="2"></script><link rel="stylesheet" href="/css/custom.css"><link rel="stylesheet" href="/css/cookies.css"><link rel="preload" as="script" href="https://assets.htmlacademy.org/js/general.v274.js"><title>Background Size, Step 1 — Frames and Backgrounds — HTML Academy</title><meta name="csrf-token" content="81664caf322823086fca37a7326b9bd2a54"><meta property="og:type" content="website"><meta property="og:site_name" content="HTML Academy"><meta name="twitter:url" property="og:url" content="https://htmlacademy.org"><meta name="twitter:title" property="og:title" content="Interactive online courses HTML Academy"><meta name="twitter:description" property="og:description" content="Together we’ll learn how to work with real code, solve true-to-life problems, use cutting edge technologies. 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Preparation</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/advanced-styling/frames-and-backgrounds/background-size-1">2. Background Size, Step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-size-2">3. Background Size, Step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-borders">4. Background Borders</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-cropping">5. Background Cropping</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/multiple-background-images">6. Multiple Background Images</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-position">7. Positioning the background relative to different borders</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-repeat-round">8. background-repeat: round</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-repeat-space">9. background-repeat: space</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/outer-frame">10. Outer Frame</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/rounding-corners-1">11. Rounding Corners, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/rounding-corners-2">12. Rounding Corners, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-source">13. Frame Image: border-image-source</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-slice">14. Frame Image: border-image-slice</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/slicing-asymmetrical-images">15. Slicing Asymmetrical Images</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-repeat-1">16. Frame Image: border-image-repeat, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-repeat-2">17. Frame Image: border-image-repeat, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-width">18. Frame Image: border-image-width</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-outset">19. Frame Image: border-image-outset</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/royal-frame">20. Muffin’s Royal Frame</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/eco-frame">21. Muffin’s Eco-Frame</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/round-frame-1">22. Muffin’s Round Frame, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/round-frame-2">23. Muffin’s Round Frame, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/challenge-1">24. Challenge: The Sea Wolf</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/frames-triangles-1">25. Frames and Triangles, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/frames-triangles-2">26. Frames and Triangles, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/frames-triangles-3">27. Frames and Triangles, Part 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/arrow-frame">28. Creating an Arrow with a Frame</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/round-arrow-frame-1">29. Creating a Round Arrow with a Frame, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/round-arrow-frame-2">30. Creating a Round Arrow with a Frame, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/real-life-triangles-1">31. Real-Life Triangles, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/real-life-triangles-2">32. Real-Life Triangles, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/challenge-2">33. Challenge: Jewelry Work</a></li></ul></div></div><a class="main-nav__course-item main-nav__course-button main-nav__course-button--next" href="/courses/advanced-styling/frames-and-backgrounds/background-size-2">Background Size, Step 2</a></div><ul class="main-nav__list main-nav__list--user main-nav__list--user-guest"><li class="main-nav__item" itemprop="name"><a class="main-nav__link" href="/signup?redirect_url=%2Fcourses%2Fadvanced-styling%2Fframes-and-backgrounds%2Fbackground-size-1" title="Sign up" data-modal="open" data-value="register" itemprop="url"><span class="main-nav__icon" aria-hidden="true"><svg aria-hidden="true"><use xlink:href="/img/sprites/general.svg#user"></use></svg></span>Sign up</a></li><li class="main-nav__item main-nav__item--login" itemprop="name"><a class="main-nav__link" href="/login?redirect_url=%2Fcourses%2Fadvanced-styling%2Fframes-and-backgrounds%2Fbackground-size-1" title="Log in" data-modal="open" data-value="login" itemprop="url"><span 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fill="#EFA75B"/><path d="M31.963 50.968c-.197-.004-.358-.157-.372-.353-.018-.207.158-.378.364-.354 3.245-.26 3.505-2.156 3.608-2.25-.006-.19.183-.325.362-.26.193.01.35.16.363.354 0 .084 0 1.906 3.422 2 .192.008.348.16.362.353-.018.19-.172.34-.363.353-1.352.11-2.68-.4-3.61-1.386-.095-.096-.16-.22-.185-.353-.982 1.174-2.423 1.866-3.952 1.898z" fill="#151841"/><path d="M32.14 43.427c.186-.52 3.608.083 3.608.083s2.975-.688 3.422.084c-.05.288-.175.557-.363.78-.515-.056-1.037.004-1.525.178-.333.61-.488 1.304-.446 2-.222.394-.574.7-.995.864-.398-.112-.75-.354-.994-.688.047-.75-.146-1.496-.55-2.13-.27-.26-1.264.084-1.626-.083l-.53-1.088zm6.89.242c-.05.286-.175.556-.363.78-.503-.063-1.015-.012-1.497.148-.333.612-.487 1.305-.446 2-.222.394-.574.7-.995.864-.4-.112-.75-.354-.996-.688.053-.76-.14-1.515-.55-2.157-.268-.26-1.263.084-1.626-.084-.26-.23-.45-.53-.55-.864" fill="#CF4A27"/><path d="M35.748 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2.334.725-.13.837-1.46.93-2.13h.112c.937.492 1.647 1.33 1.98 2.334-.388.176-.793.31-1.21.4zm18.365-2.864c-1.104-.145-2.215-.232-3.33-.26-.546-.01-1.093.05-1.626.176-1.166.483-2.08 1.425-2.53 2.604l-.158.79 1.795.623c.558.153 1.132.24 1.71.26h.28c3.245-.177 4.137-3.72 4.137-3.72l.084-.353zm-1.264 1.86c-.54 1.394-2.882 1.646-2.966 1.646-.517-.02-1.03-.11-1.525-.26-.186-.085-.633-.26-1.08-.43.374-.966 1.117-1.746 2.065-2.165 0 .68.158 1.953.81 2.083.65.13.613-1.535.566-2.26.934.005 1.865.064 2.79.177-.11.316-.473.65-.66 1.17z" fill="#151841"/><path d="M19.26 39.27c.535 1.362 1.56 2.473 2.874 3.115.534.312 1.204-.07 1.207-.69.002-.285-.15-.55-.397-.695-.918-.46-1.65-1.222-2.073-2.158-.344-.957-1.972-.52-1.61.428zm29.45 3.125c1.083-.59 2.01-1.428 2.706-2.446.3-.556-.112-1.228-.743-1.21-.293.007-.56.17-.698.428-.568.776-1.306 1.412-2.158 1.86-.394.23-.517.742-.27 1.125.263.376.773.482 1.163.242z" fill="#EFA75B" stroke-width="13"/><path d="M16.025 32.436c1.525-1.386 2.427-4.408 2.79-6.835-.084.354 2.613.43 4.138-1.208 1.078-1.125.446-2-.186-3.375-1.71-3.552-4.585-6.323-7.384-8.918-.716-.69-1.44-2.428-2.706-2-.995.353-.93 3.2-.716 4.073 1.09 7.448 4.065 18.263 4.065 18.263zm37.372-.78c-1.704-1.826-2.822-4.12-3.208-6.585 0 .354-2.614.354-4.056-1.29-.995-1.127-.362-1.86.363-3.117 1.86-3.198 4.863-5.718 7.746-8.136.81-.604 1.627-1.47 2.79-.93.994.428.715 2.334.548 3.115-1.083 5.72-2.48 11.376-4.183 16.943z" fill="#FFF"/><path d="M53.564 20.422c-1.98.51-4.138 1.636-5.105 3.487-.43-2.196 1.645-4.65 3.393-5.832.333-.21.312-.703-.037-.886-.162-.085-.357-.076-.512.022-2.157 1.562-4.417 4.5-3.784 7.188.076.262.354.41.614.325l-.075.28c-.085.603.93.864.994.26.446-2.158 2.706-3.376 4.77-3.897.372-.076.522-.526.27-.81-.133-.15-.342-.204-.53-.138zM17.457 18.06c-.55-.354-.995.428-.55.865 1.433 1.004 3.182 3.05 3.395 4.956-.93-1.86-3.05-2.975-5.105-3.486-.386-.005-.633.41-.445.747.042.076.103.14.176.184 2.073.52 4.324 1.73 4.77 3.896.106.328.5.46.78.26.273.192.653.06.745-.26.735-2.66-1.6-5.728-3.766-7.16z" fill="#F1662A"/></svg></span><p class="course-loading-overlay__message"><b class="course-loading-overlay__message-title">Loading…</b><br><span class="course-loading-overlay__message-text">Everything will be ready in few seconds</span></p></div></div><div class="course-layout__sidebar course-theory"><div class="course-theory__inner course-theory__inner--left-stub"><button class="course-theory__close icon-close icon-close--light" type="button">Close</button><ul class="course-tabs course-tabs--non-interactive course-layout__theory-heading js--theory-tabs"><li class="course-tabs__item course-tabs__item--external course-tab course-tab--centered"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered course-tab--active js--theory-tab__theory"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered js--theory-tab__comments"><span class="course-tab__icon"><svg aria-hidden="true" style="width: 16px; height: 16px; fill: #2e2c9c;"><use xlink:href="/img/sprites/up.svg#comment"></use></svg></span><span class="course-tab__title">Comments</span></li></ul><section class="course-theory__content"><div class="js--theory-pane__theory course-theory__content-inner"><h1 class="course-theory__content-heading">Background Size, Step 1</h1><div class="course-theory__content-text"><p>By default, the browser does not resize the background image.
However, what if you need to set the background to a different width and height
or bind its dimensions to the dimensions of the parent block?</p><p>You can do this using the <code>background-size</code> property. It takes two arguments as a value: the first is the width of the background image,
and the second is its height. The second argument is optional. If the height is not specified, then it is determined automatically depending on the width and original proportions.
By default, both arguments are <code>auto</code>.</p><p>Example:</p><pre><code>background-size: auto auto; /* Original image width and height */
background-size: 100px; /* Width of 100px, proportional height */
background-size: 100px 200px; /* Width of 100px, height of 200px */</code></pre><p>Let’s see how this property works in practice.</p></div></div><div class="js--theory-pane__comments hidden course-theory__content-inner"><div class="course-theory__content-text"><h2 class="course-theory__content-heading">Comments</h2><div id="disqus_thread"></div><script>
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</script><noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript></div></div></section><div class="course-theory__controls"><button class="button button--close" type="button">To the task</button></div></div></div><div class="course-layout__column course-layout__column--left"><ul class="js--course-tabs course-tabs course-layout__course-tabs"><li class="js--editor-tab course-tabs__item course-tab course-tabs__item--limited course-tabs__item--limited-large course-tab--active" data-editor="html"><span class="course-tab__title course-tab__title--indent"><span class="course-tab__title-part course-tab__title-part--active">index.html</span></span><button class="js--editor-split course-tab__button course-tab__button--split" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-split"></use></svg><span class="tooltip tooltip--light tooltip--to-top tooltip--with-wrap tooltip--short course-tab__tooltip"><span class="tooltip__wrap">Split mode</span></span></button></li><li class="js--editor-tab course-tabs__item course-tab course-tabs__item--limited course-tabs__item--limited-large" data-editor="css"><span class="course-tab__title course-tab__title--indent"><span class="course-tab__title-part course-tab__title-part--active">style.css</span></span><button class="js--editor-split course-tab__button course-tab__button--split" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-split"></use></svg><span class="tooltip tooltip--light tooltip--to-top tooltip--with-wrap tooltip--short course-tab__tooltip"><span class="tooltip__wrap">Split mode</span></span></button></li></ul><div class="course-layout__editors"><div class="js--editor course-editor course-layout__editor" id="" data-tab="html" data-split=""><span class="course-editor__label"><span class="course-editor__label-item">HTML</span><button class="course-editor__label-item course-editor__label-item--interactive hidden js--editor__unsplit-button course-editor__label-item--simple" title="No split" type="button"><svg width="7" height="10" viewBox="0 0 7 10" xmlns="http://www.w3.org/2000/svg"><g stroke="currentColor" fill="none" fill-rule="evenodd"><path stroke-linecap="round" d="M.6 3.503L3.443.518l2.842 2.985"></path><path d="M3.5 1.5v7.16" stroke-linecap="square"></path></g></svg></button></span><div class="course-editor__item" id="html-editor"><!DOCTYPE html>
<html lang="en">
<head>
<title>Background Size, Step 1</title>
<meta charset="utf-8">
<link rel="stylesheet" href="setting.css">
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="portrait"></div>
</body>
</html></div></div><div class="js--editor course-editor course-layout__editor course-editor--hidden" id="" data-tab="css" data-split=""><span class="course-editor__label"><span class="course-editor__label-item">CSS</span><button class="course-editor__label-item course-editor__label-item--interactive hidden js--editor__unsplit-button course-editor__label-item--simple" title="No split" type="button"><svg width="7" height="10" viewBox="0 0 7 10" xmlns="http://www.w3.org/2000/svg"><g stroke="currentColor" fill="none" fill-rule="evenodd"><path stroke-linecap="round" d="M.6 3.503L3.443.518l2.842 2.985"></path><path d="M3.5 1.5v7.16" stroke-linecap="square"></path></g></svg></button></span><div class="course-editor__item" id="css-editor">.portrait {
margin: 20px auto;
width: 300px;
height: 400px;
background: url("img/muffin.jpg") no-repeat #ffffff;
}
</div></div></div><div class="course-editor-controls"><button class="course-editor-controls__item course-editor-controls__item--answer" type="button">Show the answer</button></div><div class="js--feedback course-unhappy"><button class="js--feedback-btn course-unhappy__button" type="button"><span class="sr-only">Complain</span><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#unhappy"></use></svg></button><div class="js--feedback-modal course-unhappy__modal course-unhappy__modal--step-one"><form method="POST" action="/courses/advanced-styling/frames-and-backgrounds/background-size-1/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aebb92324ad"><input type="hidden" name="csrf_value" value="9cee16e8186a145553df3a94ae11f880"><p class="course-unhappy__text">What didn’t you like in this task?</p><div class="course-unhappy__slide"><div class="course-unhappy__wrap"><div class="course-unhappy__list"><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="1" type="checkbox"><span class="checkbox__text">The code check doesn’t work</span></label><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="2" type="checkbox"><span class="checkbox__text">The task is too difficult</span></label><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="3" type="checkbox"><span class="checkbox__text">The theory is hard to understand</span></label><label class="checkbox checkbox--small"><input class="js--feedback-other-checkbox checkbox__input" name="problems" value="0" type="checkbox"><span class="checkbox__text">Other (will write below)</span></label></div><div class="course-unhappy__message"><label class="sr-only" for="id-message">Другое (сейчас напишу)</label><textarea class="field field--area" id="id-message" name="message" placeholder="For example, a typo in the word «heading»"></textarea></div></div></div><button class="course-unhappy__control course-unhappy__control--prev" type="button"><span class="sr-only">Prev</span><svg aria-hidden="true"><use xlink:href="/img/sprites/landings.svg#arrow"></use></svg></button><button class="course-unhappy__control course-unhappy__control--next" type="button" disabled><span class="sr-only">Next</span><svg aria-hidden="true"><use xlink:href="/img/sprites/landings.svg#arrow"></use></svg></button><button class="js--submit-btn button" disabled>Submit</button></form><p class="course-unhappy__result hidden">Thanks! We’ll fix everything at once!</p></div></div></div><div class="course-layout__column course-layout__column--right"><span class="course-separator-control"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-arrows-separator"></use></svg></span><div class="course-browser"><div class="course-browser__menu"><span class="course-browser__menu-item course-browser__address"><span class="course-browser__menu-item-inner"><span class="course-browser__address-text"></span></span></span><button class="js--autorun course-browser__menu-item course-browser__menu-button course-browser__menu-button--text-with-icon course-browser__menu-button--autorun course-browser__menu-button--autorun-on" title="Autorun" type="button"><span class="course-browser__menu-item-inner"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-autorun"></use></svg>
Autorun
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