#CGL {
    text-align: center;
    font-family: sans-serif;
}
#CGL h1 {
    margin: .5em 0 1em;
}
#CGL h2 {
    margin: 1em 0 0.5em;
}
#CGL #CGLGrid {
    margin: 1em auto 0;
    border-collapse: collapse;
    width: 0%;
}
#CGL #CGLGrid td {
    padding: 0;
    margin: 0;
    border: 1px solid gray;
}
#CGL #CGLGrid input[type='checkbox'] {
    padding: 0;
    margin: 0;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    display: block;
    width: 30px;
    height: 30px;
    border: 0;
    background: white;
    animation: CGLDeath 250ms;
}
#CGL #CGLGrid input[type='checkbox']:checked {
    background: black;
    animation: CGLBirth 500ms;
}
#CGL button {
    padding: .4em .6em;
    border: 1px solid rgba(0, 0, 0, .2);
    border-radius: .3em;
    box-shadow: 0 1px hsla(0, 0%, 100%, .7) inset, 0 .15em .1em -.1em rgba(0, 0, 0, .3);
    background: linear-gradient(hsla(0, 0%, 100%, .3), hsla(0, 0%, 100%, 0)) hsl(80, 80%, 35%);
    color: white;
    text-shadow: 0 -.05em .05em rgba(0, 0, 0, .3);
    font: inherit;
    font-weight: bold;
    outline: none;
    cursor: pointer;
}
#CGL button:enabled:active {
    background-image: none;
    box-shadow: 0 .1em .3em rgba(0, 0, 0, .5) inset;
}
#CGL button:disabled {
    background-color: hsl(80, 20%, 40%);
    cursor: not-allowed;
}
@keyframes CGLBirth {
    50% {
        background: green;
    }
}
@keyframes CGLDeath {
    0% {
        background: rgba(184, 0, 0, .5);
    }
}