tetris.js/style.css

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: #202028;
    font-family: Roboto, Helvetica, Arial, sans-serif;
    font-size: 2.5em;
    color: #fff;
}

#language-selector {
    position: absolute;
    right: 15px;
    top: 20px;
    font-size: 14px;
    font-weight: 300;
    z-index: 1;
}

.lang {
    display: inline;
    margin-left: 10px;
    border-radius: 2px;
    padding: 4px 8px;
    cursor: pointer;
}

.lang.active {
    background-color: #3877FF;
}

#game-title {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -25%) translateY(-200px);
    opacity: 1;
    transition: opacity .5s;
}

#game-play, #game-reset {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 75px;
    font-size: 30px;
    box-shadow: none;
    color: #ffff !important;
    background: #3877FF !important;
    border: 0 !important;
    border-radius: 0 !important;
    transition: box-shadow .2s, opacity .5s;
    cursor: pointer;
    opacity: 1;
}

#game-reset {
    display: none;
    background-color: #FF0D72 !important;
    transform: translate(-50%, -50%) translateY(85px);
    opacity: 0;
}

#game-play:hover, #game-play:active, #game-play:focus {
    outline: none !important;
    box-shadow: 3px 4px 0 3px rgba(0, 0, 0, 0.2) !important;
}

#background {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    filter: url(#f2);
}

#background.blurred {
    filter: url(#f1);
}

#tetris, #tetris-background {
    position: absolute;
    left: 50%;
    top: 50%;
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    border: solid .2em #fff;
    z-index: 1;
    background: transparent;
}

#tetris-background {
    border: none;
    z-index: 0;
}

#game-stats {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) translateX(-30vw);
    text-align: right;
}

#score {
    font-weight: 900;
}

#time:before, #score:before {
    content: attr(data-prefix);
}

#controls {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) translateX(30vw);
    font-size: 20px;
}

#footer {
    position: absolute;
    bottom: 10px;
    width: 95%;
    left: 2.5%;
    right: 2.5%;
    font-size: 12px;
    color: rgba(255, 255, 255, .5);
}

#version-author {
    display: inline-block;
}

#corner-buttons {
    display: inline-block;
    position: absolute;
    right: 0;
}

#corner-buttons > a {
    text-decoration: none;
    display: inline-block;
    left: 10px;
    color: rgba(255, 255, 255, .5);
    -webkit-transition: color .2s;
    -moz-transition: color .2s;
    -ms-transition: color .2s;
    -o-transition: color .2s;
    transition: color .2s;
}

#corner-buttons > a:hover, #corner-buttons > a:active {
    color: rgba(255, 255, 255, 1);
}

@media (max-width: 1400px) {
    #tetris, #tetris-background {
        height: 75%;
    }

    #game-stats {
        top: 10px;
        left: 50%;
        transform: translateX(-50%);
    }

    #game-stats > div {
        display: inline;
    }

    #time {
        margin-right: 50px;
    }

    #controls {
        top: initial;
        bottom: 10px;
        left: 50%;
        transform: translateX(-50%);
        height: 10%;
        overflow: auto;
    }

    #control-text {
        height: 100%;
    }

    #language-selector {
        font-size: 20px;
    }
}