Pure CSS Animated UI - Fire & Ice

HTML

<input type="checkbox">

<input type="checkbox" checked>

<input type="range">

CSS

html {
    background-color: #e4ded4;
    background-image: -webkit-linear-gradient(hsla(0,0%,0%,.1), hsla(0,0%,100%,.1));
    box-shadow: inset 0 0 100px hsla(0,0%,0%,.1);
    height: 100%;
    padding: 50px;
    -webkit-box-sizing: border-box;
}
input {
    display: block;
    margin-bottom: 20px;
}

/* Checkbox */

input[type="checkbox"] {
    background-image: -webkit-linear-gradient(hsla(0,0%,0%,.1), hsla(0,0%,100%,.1)),
                      -webkit-linear-gradient(left, #f66 50%, #6cf 50%);
    background-size: 100% 100%, 200% 100%;
    background-position: 0 0, 5px 0;
    border-radius: 25px;
    box-shadow: inset 0 1px 4px hsla(0,0%,0%,.5),
                inset 0 0 10px hsla(0,0%,0%,.5),
                0 0 0 1px hsla(0,0%,0%,.1),
                0 -1px 2px 1px hsla(0,0%,0%,.25),
                0 2px 2px 1px hsla(0,0%,100%,.5),
                0 -2px 10px 2px hsla(0,0%,100%,.75),
                0 2px 10px 2px hsla(0,0%,0%,.25);
    cursor: pointer;
    height: 10px;
    padding-right: 10px;
    position: relative;
    width: 20px;
    -webkit-appearance: none;
    -webkit-transition: .15s;
}
input[type="checkbox"]:after {
    background-color: #eee;
    background-image: -webkit-linear-gradient(hsla(0,0%,100%,.1), hsla(0,0%,0%,.1));
    border-radius: 25px;
    box-shadow: inset 0 1px 1px 1px hsla(0,0%,100%,1),
                inset 0 -1px 1px 1px hsla(0,0%,0%,.25),
                0 1px 3px 1px hsla(0,0%,0%,.5),
                0 0 2px hsla(0,0%,0%,.25);
    content: '';
    display: block;
    height: 10px;
    left: 0;
    position: relative;
    top: 0;
    width: 10px;
}
input[type="checkbox"]:checked {
    background-position: 0 0, 15px 0;
    padding-left: 10px;
    padding-right: 0;
}
input[type="checkbox"]:hover:before {
    background: hsla(0,0%,0%,.25);
    border-radius: 10px;
    color: #e4ded4;
    content: '✘';
    font: 12px/20px sans-serif;
    height: 20px;
    left: 25px;
    letter-spacing: 1px;
    position: absolute;
   ...

JavaScript

// Feel free to do with this what you will.
    
// If you do something mind blowing, then let me know! http://twitter.com/_joshnh