{"componentChunkName":"component---src-templates-tag-js","path":"/tags/loader/","result":{"data":{"site":{"siteMetadata":{"title":"LoginRadius Blog"}},"allMarkdownRemark":{"totalCount":1,"edges":[{"node":{"fields":{"slug":"/engineering/create-a-loading-spinner-using-css/"},"html":"

Hey there, yogi bear. Tired of creating gifs? Seriously, that takes time and most of the time it has a huge file size and a crappy resolution. What if you can create a gif(ish) element out of CSS? Because you can.

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CSS has come a long way we can now create our own GIF-ish contents and the best part, we have full control over it.

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Great, how do I do it?

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First things first, we need our html structure that will hold all the things we need. There's the container:

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<div class="container"> <!--There's the container that centers it-->\n    <div class="spinner-frame"> <!--The background-->\n        <div class="spinner-cover"></div> <!--The Foreground-->\n        <div class="spinner-bar"></div> <!--and The Spinny thing-->\n    </div>\n</div>
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Easy, right? Now we need to add them styles to our html's.

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.container {\n    position: fixed;\n    top: 0;\n    left: 0;\n    right: 0;\n    bottom: 0;\n    text-align: center;\n    background: #eee;\n}\n.container:before {\n    content: "";\n    height: 100%;\n    display: inline-block;\n    vertical-align: middle;\n}
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Since, it's a spinner and normally covers the whole page. The combination of \"position: fixed\" and bottom, top, left, right as 0 will do that for you. ( We don't want the users to click everywhere, right?).

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The :before pseudo element will help you center the spinner correctly (without the help of negative margins). How? If you look at the container class, it has a \"text-align: center\" which aligns inline elements like the pseudo element :before. But, we need to add height on that thing and inline elements do not like that. So, we need to change the display from inline to inline-block and add \"vertical-align: middle\" so it aligns vertically.

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Now the for the fun stuff.

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We need to style the spinner frame.

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.container .spinner-frame {\n    display: inline-block;\n    vertical-align: middle;\n    width: 100px;\n    height: 100px;\n    border-radius: 50%;\n    position: relative;\n    overflow: hidden;\n    border: 5px solid #fff;\n    padding: 10px;\n}
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A couple of things here. Since it's a DIV, by default it's a block element. We need to change that to an inline-block so it accepts the text-align and centers itself with the :before pseudo element. Then add a \"vertical-align: middle\" and viola!! Centered!

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A spinner won't be a spinner if it's not a circle. A 50% border-radius will work properly if you have a perfect 1:1 ratio. Now we need to push everything inside (and automatically center it), adding consistent padding will do that for you.

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Now for the foreground or spinner-cover.

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.container .spinner-frame .spinner-cover {\n    background: #fff;\n    width: 100%;\n    height: 100%;\n    border-radius: 50%;\n    position: relative;\n    z-index: 2;\n}
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This will add a white cover on top of the spinner and hide everything that we don't need inside it. You know what they say... If you can't remove it, hide it.

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For the spinny thing:

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.container .spinner-frame .spinner-bar {\n    background: #29d;\n    width: 50%;\n    height: 50%;\n    position: absolute;\n    top: 0;\n    left: 0;\n    border-radius: 100% 0 0 0;\n    -webkit-animation: spinny 2s linear infinite;\n    transform-origin: 100% 100%;\n}\n@-webkit-keyframes spinny {\n    0% {\n        transform: rotate(0deg);\n        background: #29d;\n    }\n    50% {\n        transform: rotate(180deg);\n        background: #00427c;\n    }\n    100% {\n        transform: rotate(360deg);\n        background: #29d;\n    }\n}
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This one needs more advance CSS in it because this is the only thing that moves.

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We need to tell the element that the center point is not on the center of the element but on the bottom right edge where it spins. The CSS \"transform-origin: 100% 100%\" will do that easily for you.

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Since it's an animated element, overflow hidden (for some reason) doesn't work on this guy. So, we need to curve to top left part of it. The CSS \"border-radius: 100% 0 0 0\" will do that for you.

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We also need to push it on the top left where it starts spinning \"position: absolute\" with top and left 0 will push it there.

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Now we need to animate it using key-frames. From 0% to 100% the \"transform: rotate()\" from 0 degrees (0deg) to 360 degrees (360deg) will rotate it forever. FOREVER!

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A tutorial wouldn't be complete without a demo.

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See the Pen azVwqj by Darryl Tec (@notdarryltec) on CodePen.

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