Jazzy CSS Checkbox

This code snippet was published on .

        <pre class="codepen" data-slug-hash="Cbiun" data-default-tab="result" data-theme-id="119" data-user="chrisburnell" data-safe="true" data-height="250px">
            <code></code>
        </pre>
<input type="checkbox" id="jazzycheckbox" role="checkbox" aria-checked="false">
<label for="jazzycheckbox" class="check">Check me!</label>
html,
body
{
height: 100%;
}
body {
font: 600 20px/3em sans-serif;
position: relative;
}
input[type="checkbox"] {
opacity: 0;
position: absolute;
left: 0;
bottom: 100%;
}
.check {
background-color: salmon;
background-clip: padding-box;
color: snow;
display: block;
padding: 0 2.5em;
overflow: hidden;
position: absolute;
top: 50%;
left: 50%;
white-space: nowrap;
cursor: pointer;
user-select: none;
border-radius: .375em;
transform: translate3d(-50%, -50%, 0);
transition: all .15s ease-in-out .1s;
input[type="checkbox"]:focus + &,
input[type="checkbox"]:checked:focus + &
{
box-shadow: 0 0 0 .3em rgba(black, .2);
}
input[type="checkbox"]:checked + & {
background-color: darkseagreen;
padding-right: 1.5em;
padding-left: 3.5em;
}
&:before {
content: "✔";
font-size: 1.5em;
position: absolute;
top: 0;
left: 1em;
transform: translateX(-2em);
transition: all .15s ease-in-out;
}
input[type="checkbox"]:checked + &:before {
transform: none;
transition: all .25s ease-in-out;
}
}