Let’s work on the selected state of our label::before or “pseudo-checkbox”.
Transform the pseudo-checkbox when it is selected into a checkmark, which is a flattened turquoise block without a border along the top and right edges.
To manage the selected state of the pseudo-box, let’s create a CSS rule with the following selector:
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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>Checkboxes, step 2 — Smooth transitions — HTML Academy</title><meta name="csrf-token" content="64964caf322823086fca37a7326b9bd2a54"><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. Minimum of boring theory and lots of practical tasks."><meta name="twitter:image" property="og:image" content="https://htmlacademy.org/og/htmlacademy.png"><meta name="twitter:card" content="summary_large_image"><link rel="canonical" href="https://htmlacademy.org/courses/dynamic/smooth-transitions/checkboxes-2"><meta name="theme-color" content="#2f358f"></head><body class="course-interface course-interface--light" data-base="/assets/courses/33/"><header class="page-header page-header--course"><div class="page-header__inner"><div class="page-header__top"><a class="page-header__logo" href="/" aria-label="HTML Academy Home"><img src="https://assets.htmlacademy.org/img/logo--small.svg?cs=1218aec0be4a5f23db79ad29a14e30f7f9fb9a25" width="24" height="36" alt="HTML Academy"></a><nav class="main-nav main-nav--mini" role="navigation"><div class="main-nav__course-nav"><a class="main-nav__course-item main-nav__course-button main-nav__course-button--prev" href="/courses/dynamic/smooth-transitions/checkboxes">Checkboxes, step 1</a><div class="main-nav__course-item main-nav__course-list main-nav__course-list--collapsed"><b class="main-nav__course-title">Smooth transitions</b><span class="main-nav__course-stat">13/29</span><div class="main-nav__course-contents"><a class="main-nav__course-contents-link" href="/courses/dynamic/smooth-transitions">Back to the list of tasks</a><ul class="main-nav__course-contents-list"><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-duration">1. The transition-duration property</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-duration-2">2. Transition duration, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-property">3. The transition-property: which properties can be changed smoothly?</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-delay">4. The transition-delay property</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-timing-function">5. The “form” of the transition, transition-timing-function</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-timing-function-2">6. transition-timing-function, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-timing-function-3">7. transition-timing-function, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-timing-function-4">8. transition-timing-function, step 4</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/paper-buttons">9. Paper buttons, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/paper-buttons-2">10. Paper buttons, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/paper-buttons-3">11. Paper buttons, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/checkboxes">12. Checkboxes, step 1</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/dynamic/smooth-transitions/checkboxes-2">13. Checkboxes, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/checkboxes-3">14. Checkboxes, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/radio-button">15. Radio buttons, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/radio-button-2">16. Radio buttons, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/radio-button-3">17. Radio buttons, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/toggle-switches">18. Toggle switches, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/toggle-switches-2">19. Toggle switches, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/toggle-switches-3">20. Toggle switches, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/toggle-switches-4">21. Toggle switches, step 4</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transformer-icon">22. The transformer icon, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transformer-icon-2">23. The transformer icon, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transformer-icon-3">24. The transformer icon, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transformer-icon-4">25. The transformer icon, step 4</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/text-input-field">26. Text input field, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/text-input-field-2">27. Text input field, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/text-input-field-3">28. Text input field, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/text-input-field-4">29. Text input field, step 4</a></li></ul></div></div><a class="main-nav__course-item main-nav__course-button main-nav__course-button--next" href="/courses/dynamic/smooth-transitions/checkboxes-3">Checkboxes, step 3</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%2Fdynamic%2Fsmooth-transitions%2Fcheckboxes-2" 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%2Fdynamic%2Fsmooth-transitions%2Fcheckboxes-2" title="Log in" data-modal="open" data-value="login" itemprop="url"><span class="main-nav__icon" aria-hidden="true"><svg aria-hidden="true"><use 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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">Checkboxes, step 2</h1><div class="course-theory__content-text"><p>Let’s work on the selected state of our <code>label::before</code> or “pseudo-checkbox”.</p><p>Transform the pseudo-checkbox when it is selected into a checkmark, which is a flattened turquoise block without a border along the top and right edges.</p><p>To manage the selected state of the pseudo-box, let’s create a CSS rule with the following selector:</p><pre><code>input[type="checkbox"]:checked ~ label::before { ... }</code></pre></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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<html lang="en">
<head>
<title>Checkboxes, step 2</title>
<meta charset="utf-8">
<link rel="stylesheet" href="material.css">
<link rel="stylesheet" href="style.css">
</head>
<body class="green-theme">
<section class="card">
<h1 class="question"><span>What are the correct values for the position property?</span></h1>
<form class="answers" action="https://echo.htmlacademy.ru/courses" method="post">
<button class="fab" type="submit">&#58882;</button>
<div>
<input type="checkbox" id="answer1">
<label for="answer1">absolute</label>
</div>
<div>
<input type="checkbox" id="answer2">
<label for="answer2">great</label>
</div>
<div>
<input type="checkbox" id="answer3">
<label for="answer3">majestic</label>
</div>
</form>
</section>
</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">label {
position: relative;
cursor: pointer;
}
label::before {
position: absolute;
top: 0;
left: -44px;
z-index: 1;
width: 16px;
height: 16px;
border: 2px solid #5a5a5a;
content: "";
}
input[type="checkbox"] {
display: none;
}
input[type="checkbox"]:checked ~ label::before {
}
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Click inside the mini-browser to shift the focus onto this window.
</p></div></div><div class="course-browser__menu course-browser__menu--vertical"><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--increase" type="button" disabled title="Larger"><span class="course-browser__menu-item-inner">Larger</span></button><span class="course-browser__menu-item course-browser__zoom"><span class="course-browser__menu-item-inner">100%</span></span><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--decrease" type="button" title="Smaller"><span class="course-browser__menu-item-inner">Smaller</span></button></div><div class="js--validation-view course-browser__results-restriction course-browser__results-restriction--mini"><span class="tooltip tooltip--light tooltip--short course-browser__results-restriction-tooltip"><span class="js--tooltip-text"></span><button class="js--validation-view-close course-browser__results-restriction-tooltip-close icon-close" type="button">Закрыть</button></span></div></div><div class="course-goals js--goals"><div class="course-goals__heading"><span class="course-goals__heading-title"><span class="course-goals__count-label">Goals</span><span class="course-goals__count">completed</span></span><div class="js--annotations course-task-stats course-task-stats--disabled course-task-stats--centered "><span class="course-task-stats__indicator"><svg width="12" height="12" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M15 8C15 11.866 11.866 15 8 15C4.13403 15 1 11.866 1 8C1 4.13403 4.13403 1 8 1C11.866 1 15 4.13403 15 8ZM16 8C16 12.4183 12.4183 16 8 16C3.58173 16 0 12.4183 0 8C0 3.58173 3.58173 0 8 0C12.4183 0 16 3.58173 16 8ZM6.7287 3.88849C6.6958 3.59229 6.92761 3.33325 7.22565 3.33325H8.77502C9.07306 3.33325 9.30487 3.59229 9.27197 3.88849L8.71643 8.88849C8.68829 9.14166 8.47424 9.33325 8.21948 9.33325H7.78119C7.52643 9.33325 7.31238 9.14166 7.28424 8.88849L6.7287 3.88849ZM9.33368 12.0001C9.33368 12.7365 8.73669 13.3334 8.00031 13.3334C7.26392 13.3334 6.66699 12.7365 6.66699 12.0001C6.66699 11.2637 7.26392 10.6667 8.00031 10.6667C8.73669 10.6667 9.33368 11.2637 9.33368 12.0001Z" fill="currentColor"></path></svg><span class="js--annotations-counter course-task-stats__counter">0</span></span><div class="course-task-stats__scroller-wrapper"><div class="course-task-stats__scroller"><ul class="js--annotations-list course-task-stats__list"></ul></div></div></div><button class="course-goals__button course-goals__button--expand js--goals__expand" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-collapse"></use></svg></button><a class="course-goals__button course-goals__button--next button button--green button--without-border hidden" href="/courses/dynamic/smooth-transitions/checkboxes-3" title="Checkboxes, step 3"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#arrow-white--mini"></use></svg></a></div><div class="course-goals__content"><p class="course-goals__visible-text">Set the following for the selected state of the pseduo-checkbox:</p><ol class="course-goals__list"><li class="course-goals__list-item">a width of <code>21px</code> and a height of <code>10px</code><span class="mark">,</span></li><li class="course-goals__list-item">border color of <code style="color: #00bad2;">#00bad2</code><span class="mark">,</span></li><li class="course-goals__list-item">top and right edge border style of <code>none</code><span class="mark">.</span></li></ol><p class="course-goals__visible-text">Toggle the checkboxes to test the result.</p></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
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