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<h1 id="faking-3d-elements-with-css">Faking 3D Elements with CSS</h1>
<p>2020-04-29</p>
<p>Although not always practical, creating the illusion that some of your web elements are 3D can be a fun experiment. I set out to see if I was able to create such an illusion with only 2 HTML elements and as little CSS as possible.</p>
<p>This is what I ended up creating:</p>
<p><img src="/public/images/css-orb.png" alt="Blue 3D orb made out pure CSS" /></p>
<p><a href="https://codepen.io/bradleytaunt/pen/VwvzKyb">Live CodePen Example</a></p>
<h2 id="the-html">The HTML</h2>
<p>Prepare for your mind to be blown:</p>
<pre><code><div class="main-orb">
<div class="inner-orb"></div>
</div>
</code></pre>
<p>That’s it - I wasn’t kidding when I said we would use only 2 HTML elements. The <code>.main-orb</code> is the core shape (set to 400x400) and the <code>.inner-orb</code> is placed on top of it’s parent at a slightly smaller size (360x360) - but more on that below in the CSS portion.</p>
<h2 id="the-css">The CSS</h2>
<p>First we give the bigger orb element (<code>.main-orb</code>) the default styling needed to represent a 2D circle:</p>
<pre><code>.main-orb {
background: linear-gradient(#fff 0%, #eee 10%, #2E86FB 50%, #1A237E 100%);
border-radius: 9999px;
height: 400px;
margin: 4rem auto;
position: relative; /* This is important for the inner orb element later */
width: 400px;
}
</code></pre>
<p>Next, we include both <code>:before</code> and <code>:after</code> pseudo elements for our orb’s drop shadow. You <em>could</em> do this with a simple <code>box-shadow</code> property on the <code>.main-orb</code> itself, but I’ve explained in a previous post why <a href="/blog/better-box-shadows.html">that’s not the best approach</a>.</p>
<pre><code>/* Shared styling for both pseudo elements - Remember DRY */
.main-orb:before, .main-orb:after {
border-radius: 200px 200px 9999px 9999px;
bottom: -10px;
content:'';
filter: blur(20px);
height: 40px;
position: absolute;
z-index: -1;
}
/* Bigger, lighter shadow */
.main-orb:before {
background: rgba(0,0,0,0.4);
left: 7.5%;
width: 85%;
}
/* Smaller, darker shadow */
.main-orb:after {
background: rgba(0,0,0,0.7);
left: 20%;
width: 60%;
}
</code></pre>
<p>With our main orb complete we can move on to the <code>.inner-orb</code> element to help bring slightly more depth to our floating ball of CSS:</p>
<pre><code>.inner-orb {
background: linear-gradient(#fff 0%, #2E86FB 60%, #283593 100%);
border-radius: 9999px;
box-shadow: 0 8px 20px rgba(0,0,0,0.5);
height: 360px;
filter: blur(18px);
left: 20px;
position: absolute;
top: 15px;
width: 360px;
}
</code></pre>
<h2 id="poor-mans-3d-elements">Poor-man’s 3D elements</h2>
<p>Clearly implementing something like this will never come close to generating true 3D renders on a website, but it is a fun exercise to see how much further we can push simple CSS. Feel free to fork the above CodePen to play around with different colors and shadow placements.</p>
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