style.css

body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #080e2e;
    font-family: 'Montserrat', sans-serif;
}
#clock h2{
    position: relative;
    display: block;
    color: white;
    text-align: center;
    margin: 10px 0;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.4em;
    font-size: 1em;
}
#clock h1{
    position: relative;
    display: block;
    color: rgb(252, 104, 104);
    text-align: center;
    margin: 10px 0;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.4em;
    font-size: 2.5em;
}

#clock #time{
    display: flex;
}

#clock #time div{
    position: relative;
    margin: 0 5px;
    -webkit-box-reflect: below 1px linear-gradient(transparent,#0004);
}
#clock #time div span{
    position: relative;
    display: block;
    width: 100px;
    height:80px;
    background: #108aaf;
    color: white;
    font-weight: 300;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3em;
    z-index: 10;
    box-shadow: 0 0 0 1px rgba(0, 0, 0, .2);

}

#clock #time div span:nth-child(2){
    height: 30px;
    font-size: 0.7em;
    letter-spacing: 0.2em;
    font-weight: 500;
    z-index: 9;
    box-shadow: none;
    background: #064457;
    text-transform: uppercase;
}
#clock #time div:nth-last-child(2) span{
    background: #ff006a;
}
#clock #time div:nth-last-child(2) span:nth-child(2){
    background: #81083b;
}
#clock #time div:nth-last-child(1) span{
    position: absolute;
    bottom: 0;
    width: 60px;
    height: 40px;
    font-size: 1.5em;
    background: #fff;
    color: #000;
    -webkit-box-reflect: below 1px linear-gradient(transparent,#0004);
}