Material Flipside Button with animation

HTML
1
2
<div class="btn">
<div class="btn-back">
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SCSS
1
2
$transition-duration: 0.8s;
$transition-easing: cubic-bezier(0.230, 1
    .000, 0.320, 1.000);
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JAVASCRIPT
1
var btn = document.querySelector( '.btn'
    );
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