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    <p><strong>Theory</strong></p> <p>Looking at current implementation of the pinterest site (it might change in the future), when you open the overlay a <code>noscroll</code> class is applied to the <code>body</code> element and <code>overflow: hidden</code> is set, thus <code>body</code> is no longer scrollable.</p> <p>The overlay (created on-the-fly or already inside the page and made visible via <code>display: block</code>, it makes no difference) has <code>position : fixed</code> and <code>overflow-y: scroll</code>, with <code>top</code>, <code>left</code>, <code>right</code> and <code>bottom</code> properties set to <code>0</code>: this style makes the overlay fill the whole viewport. </p> <p>The <code>div</code> inside the overlay is instead just in <code>position: static</code> then the vertical scrollbar you see is related to that element. As a result the content is scrollable but overlay remains fixed.</p> <p>When you close the zoom you hide the overlay (via <code>display: none</code>) and then you could also entirely remove it via javascript (or just the content inside, it's up to you how to inject it).</p> <p>As a final step you have to also remove the <code>noscroll</code> class to the <code>body</code> (so the overflow property returns to its initial value)</p> <hr> <p><strong>Code</strong></p> <blockquote> <p><a href="http://codepen.io/anon/pen/xZBovY?editors=0110" rel="noreferrer">Codepen Example</a> </p> </blockquote> <p>(it works by changing the <code>aria-hidden</code> attribute of the overlay in order to show and hide it and to increase its accessibility).</p> <p><strong>Markup</strong><br> <em>(open button)</em></p> <pre><code>&lt;button type="button" class="open-overlay"&gt;OPEN LAYER&lt;/button&gt; </code></pre> <p><em>(overlay and close button)</em></p> <pre><code>&lt;section class="overlay" aria-hidden="true"&gt; &lt;div&gt; &lt;h2&gt;Hello, I'm the overlayer&lt;/h2&gt; ... &lt;button type="button" class="close-overlay"&gt;CLOSE LAYER&lt;/button&gt; &lt;/div&gt; &lt;/section&gt; </code></pre> <p><strong>CSS</strong></p> <pre><code>.noscroll { overflow: hidden; } .overlay { position: fixed; overflow-y: scroll; top: 0; right: 0; bottom: 0; left: 0; } [aria-hidden="true"] { display: none; } [aria-hidden="false"] { display: block; } </code></pre> <p><strong>Javascript</strong> <em>(vanilla-JS)</em></p> <pre><code>var body = document.body, overlay = document.querySelector('.overlay'), overlayBtts = document.querySelectorAll('button[class$="overlay"]'); [].forEach.call(overlayBtts, function(btt) { btt.addEventListener('click', function() { /* Detect the button class name */ var overlayOpen = this.className === 'open-overlay'; /* Toggle the aria-hidden state on the overlay and the no-scroll class on the body */ overlay.setAttribute('aria-hidden', !overlayOpen); body.classList.toggle('noscroll', overlayOpen); /* On some mobile browser when the overlay was previously opened and scrolled, if you open it again it doesn't reset its scrollTop property */ overlay.scrollTop = 0; }, false); }); </code></pre> <hr> <p>Finally, here's another example in which the overlay opens with a fade-in effect by a CSS <code>transition</code> applied to the <code>opacity</code> property. Also a <code>padding-right</code> is applied to avoid a reflow on the underlying text when the scrollbar disappears.</p> <blockquote> <p><a href="http://codepen.io/anon/pen/ZWWgZJ?editors=0110" rel="noreferrer">Codepen Example (fade)</a> </p> </blockquote> <p><strong>CSS</strong></p> <pre><code>.noscroll { overflow: hidden; } @media (min-device-width: 1025px) { /* not strictly necessary, just an experiment for this specific example and couldn't be necessary at all on some browser */ .noscroll { padding-right: 15px; } } .overlay { position: fixed; overflow-y: scroll; top: 0; left: 0; right: 0; bottom: 0; } [aria-hidden="true"] { transition: opacity 1s, z-index 0s 1s; width: 100vw; z-index: -1; opacity: 0; } [aria-hidden="false"] { transition: opacity 1s; width: 100%; z-index: 1; opacity: 1; } </code></pre>
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    1. COThis is the correct answer. Someone should give it a check mark as it is correct.
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    2. COThis is absolutely correct, but be warned, it doesn't work in mobile safari. The background will continue to scroll and your overlay will be fixed.
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    3. CODoes anyone have the solution to iOS 5 Mobile Safari?
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