html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: 'Varela Round', sans-serif;
}

.viewer{
    display: block;
    width: 100%;
    height: calc(100% - 60px);
}
    #api-frame {
        display: block;
        width: 100%;
        height: 100%;
        border: 0;
    }
    .viewer .overlay {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
    }

.score {
    position: absolute;
    left: 30px;
    top: 90px;
    font-size: 36px;
    color: white;
    text-shadow: 1px 1px 0 rgba(0,0,0,.5);
}

.time {
    position: absolute;
    right: 30px;
    top: 90px;
    font-size: 36px;
    color: white;
    text-shadow: 1px 1px 0 rgba(0,0,0,.5);
}

.intro {
    position: absolute;
    top: 50%;
    left: 50%;
    padding: 40px;
    background: rgba(0,0,0,.8);
    color: #fff;
    transform: translate(-50%, -50%);
    border-radius: 6px;
    text-align: center;
}
.intro.hidden {
    display: none;
}

    .intro img {
        width: 100px;
        margin-bottom: 20px;
    }