If the shadow has a non-zero feathering radius, then it automatically becomes semi-transparent. But sometimes you need to make a semi-transparent shadow without a feathering radius (such as, for example, for buttons in your mini-browser).
To do this, you can use the new colors format for CSS, rgba. Example:
color: red;
color: #ff0000;
color: rgba(255, 0, 0, 0.5);
All of the color entries in the example are set to red, but the last entry is set to red with 50% transparency.
In rgba, the first three values specify the color, where they can be any integer between 0 and255. The last value specifies the transparency level and can be a fractional number of between 0 (full transparency) and 1.
You can set a semi-transparent color using rgba not only for shadows, but also for other properties with a color, including: frames, the background, and so on.
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The box-shadow Property</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/horizontal-shadow-offset">2. Horizontal Shadow Offset</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/vertical-shadow-offset">3. Vertical Shadow Offset</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/shadow-feathering">4. Shadow Feathering</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/stretching-shadow">5. Stretching the Shadow</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/feathering-stretch">6. Feathering + Stretch</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/shadow-color">7. Shadow Color</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/inner-shadow">8. Inner Shadow</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/challenge-1">9. Challenge: Dim Shadows</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/advanced-styling/shadows/semi-transparent-shadow">10. Semi-Transparent Shadow</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/one-side-shadow">11. Casting a Shadow Only from One Side</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/multiple-shadows">12. Multiple Shadows</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/multiple-borders">13. Multiple Borders for One Element</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/shadows/shadow-art">14. 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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">Semi-Transparent Shadow</h1><div class="course-theory__content-text"><p>If the shadow has a non-zero feathering radius, then it automatically becomes semi-transparent. But sometimes you need to make a semi-transparent shadow without a feathering radius (such as, for example, for buttons in your mini-browser).</p><p>To do this, you can use the new colors format for CSS, <code>rgba</code>. Example:</p><pre><code>color:<span style="color: red;"> red</span>;
color:<span style="color: #ff0000;"> #ff0000</span>;
color:<span style="color: rgba(255,0,0,0.5);"> rgba(255, 0, 0, 0.5)</span>;</code></pre><p>All of the color entries in the example are set to red, but the last entry is set to red with 50% transparency.</p><p>In <code>rgba</code>, the first three values specify the color, where they can be any integer between <code>0</code> and<code>255</code>. The last value specifies the transparency level and can be a fractional number of between <code>0</code> (full transparency) and <code>1</code>.</p><p>You can set a semi-transparent color using <code>rgba</code> not only for shadows, but also for other properties with a color, including: frames, the background, and so on.</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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<html lang="en">
<head>
<meta charset="utf-8">
<title>Semi-Transparent Shadow</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<button class="btn btn1" type="button">Feed</button>
<button class="btn btn2" type="button">Chase</button>
</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">.btn1 {
box-shadow: 0 0 0 15px #27ae60;
}
.btn2 {
box-shadow: 0 0 0 15px #e74c3c;
}
body {
padding-top: 200px;
background: url("muffin.jpg") no-repeat 40% 0;
background-size: auto 700px;
font-size: 18px;
font-family: "Tahoma", sans-serif;
}
.btn {
display: block;
margin: 50px auto;
padding: 15px 20px;
width: 150px;
border: none;
box-sizing: content-box;
background-color: #2c3e50;
color: white;
text-align: center;
text-transform: uppercase;
font: inherit;
}
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