style.css

* {
    image-rendering: pixelated;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

table {
    border-collapse: separate;
    background-color: transparent;
}

rainbow {
    color: rgba(0, 0, 0, 0.459);
    background: linear-gradient(to right,
            red, orange, yellow, green, blue, indigo, violet, indigo, blue, green, yellow, orange, red);
    background-size: 500%;
    animation: rainbow-flow infinite linear 36s;
    -webkit-background-clip: text;
    background-clip: text;
}

blink {
    animation: blink_keys 1s step-start infinite;
}

@keyframes blink_keys {
    50% { opacity: 0; }
}

img.emoji {
    display: inline-block;
    vertical-align: middle;
    margin: 0 2px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    max-width: 16px;
    max-height: 16px;
}

#default-emoji {
    image-rendering: crisp-edges;
    image-rendering: -webkit-optimize-contrast;
}

@keyframes rainbow-flow {
    0% {
        background-position: 50% 0%;
    }

    100% {
        background-position: -200%;
    }
}