.clock {
    display: inline-block;
    width: 100%;
    color: #fff;
}

.clock > .time {
    display: inline-block;
    width: 25%;
    float: left;
}
.clock > .time > .value {
    font-size: 50px;
    line-height: 60px;
    font-weight: bold;
}
.clock > .time > .label {
    font-size: 15px;
    line-height: 15px;
    text-transform: uppercase;
}

@media (max-width: 500px) {
    .clock > .time {
        display: inline-block;
        width: 50%;
    }
    .clock > .time:nth-of-type(1),
    .clock > .time:nth-of-type(2) {
        margin-bottom: 30px;
    }
}