CSS para contador regresivo

contador-regresivo.css

/*! Contador regresivo v1.0.0 */
/*reset*/
.counter-clock, 
.counter-clock *, 
.counter-clock ::after, 
.counter-clock ::before {
    box-sizing: border-box;
}

/*contador*/
.counter-clock {
    font-size: 14px;
    border-radius: 5px;
    padding-bottom: .5em;
}
.counter-clock::after {
    display: block;
    content: "";
    clear: both;
}
.counter-clock__item  {
    background: #212121;
    color: #fff;
    font-size: 1.2em;
    padding: 1em .5em;
    margin: 0 .3em 0 0;
    border-radius: 3px;
    position: relative;
    line-height: 1;
    box-shadow: 0 60px 60px -30px rgba(255,255,255,.05) inset, 0 2px 1px 0 rgba(0,0,0,1);
    position: relative;
    float:left;
}
.counter-clock__item::before {
    content:"";
    position: absolute;
    width: 100%;
    top: 50%;
    display: block;
    border-top: 1px solid rgba(0,0,0,.5);
    margin-top: -1px;
    left: 0;
    border-bottom: 1px solid rgba(255,255,255,.1);
    box-shadow: 0 0 10px 0 rgba(0,0,0,.5);
}
.counter-clock__info {
    padding: 1em;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
    margin: 0 0 1em;
    font-weight: 500;
    color: rgba(0, 0, 0, .8);
}