minesweeper.js/css/style.css

html {
    overflow: hidden;
}

body {
    margin: 0;
    font-family: Roboto, Helvetica, Arial, sans-serif;
    font-size: 1.4em;
}

.start-background {
    width: 100vw;
    height: 100vh;
    background-color: #333;
    -webkit-transition: background-color .5s;
    -moz-transition: background-color .5s;
    -o-transition: background-color .5s;
    transition: background-color .5s;
}

.start-background.transparent {
    background-color: transparent;
}

.start-container {
    position: absolute;
    top: 50%;
    left: 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%);
    color: #fff;
    text-align: center;
}

.start-container.slideDown {
    animation: slideDown .5s ease-in-out forwards;
}

@keyframes slideDown {
    0% {
        top: 50%;
    }

    100% {
        top: 150%;
    }
}

.start-container.slideUp {
    animation: slideUp .5s ease-in-out forwards;
}

@keyframes slideUp {
    0% {
        top: 100%
    }

    100% {
        top: 50%;
    }
}

.start-container h3 {
    font-weight: lighter;
}

button {
    border: none;
    border-radius: 10px;
    box-shadow: none;
    background-color: #2272ff;
    color: #fff;
    padding: 20px 40px;
    font-size: 28px;
    -webkit-transition: all .2s;
    -moz-transition: all .2s;
    -o-transition: all .2s;
    transition: all .2s;
    cursor: pointer;
    transform: translateY(0);
}

.game-stats button {
    font-size: 2vh;
    padding: 1.25vh 2vw;
}

.game-stats .restart {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

button:hover {
    box-shadow: 0 5px 0 #3562c1, 0 10px 20px rgba(0, 0, 0, .18);
    transform: translateY(-5px);
}

button:active {
    background-color: #1e64cd;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
}

.game-container {
    position: absolute;
    bottom: 2.5%;
    left: 50%;
    transform: translateX(-50%);
}

.game-stats {
    position: absolute;
    top: calc(2.5vh / 2);
    left: 50%;
    height: 5vh;
    width: 1592px;
    transform: translateX(-50%);
}

.stat-container {
    float: left;
    background-color: black;
    border-radius: 10px;
    color: red;
    font-size: 4vh;
    font-family: "SF Digital Readout", Roboto, Arial, sans-serif;
    margin: 0 10px;
}

.stat-container.right {
    float: right;
}

#time, #bombs {
    margin: 0 15px;
}

.main-container {
    position: absolute;
    top: -100%;
    width: 100%;
    height: 100%;
    animation: slideIn .5s ease-in-out forwards;
}

@keyframes slideIn {
    from {
        top: -100%;
    }

    to {
        top: 0;
    }
}

.popAway {
    animation: popAway .5s forwards;
    -webkit-transform-origin: 50%;
    -moz-transform-origin: 50%;
    -ms-transform-origin: 50%;
    -o-transform-origin: 50%;
    transform-origin: 50%;
    top: 0;
}

@keyframes popAway {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }

    100% {
        transform: scale(0);
    }
}