style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    min-height: 100vh;
    background: rgb(30, 0, 54);
}
footer{
    position: fixed;
    bottom: 20px;
    opacity: .3;
    transition: opacity .2s ease-in-out;
    padding: 5px 10px;
    border: 2px solid #c77700;
}
footer:hover{
    opacity: 1;
}
h3{
    color: #fff;
    font-family: sans-serif;
}
h3 a{
    color: #c77700;
    text-decoration: none;
}
.clock{
    width: 500px;
    height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: url(clock4_alt.png);
    background-size: cover;
    border: 6px solid rgb(30, 0, 54);
    border-radius: 100%;
    box-shadow: 0 -15px 15px rgba(255, 255, 255, 0.05),
                inset 0 -15px 15px rgba(255, 255, 255, 0.05),
                0 15px 15px rgba(0, 0, 0, 0.5),
                inset 0 15px 15px rgb(0, 0, 0, 0.5);
}
.clock:before{
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: rgb(255, 255, 255);
    border-radius: 100%;
    z-index: 100;
}
.clock .hour,
.clock .min,
.clock .sec{
    position: absolute;
}
.clock .hour, .hr{
    width: 165px;
    height: 230px;
}
.clock .min, .mn{
    width: 192px;
    height: 292.5px;
}
.clock .sec, .sc{
    width: 235px;
    height: 375px;
}
.hr, .mn, .sc{
    display: flex;
    justify-content: center;
    position: absolute;
    border-radius: 100%;
}
.hr:before{
    content: '';
    position: absolute;
    width: 15px;
    height: 120px;
    background: #ff0000;
    z-index: 10;
    border-radius: 100px 100px 10px 10px;
}
.mn:before{
    content: '';
    position: absolute;
    width: 10px;
    height: 150px;
    background: rgb(0, 255, 255);
    z-index: 11;
    border-radius: 100px 100px 10px 10px;
}

.sc:before{
    content: '';
    position: absolute;
    width: 5px;
    height: 195px;
    background: rgb(0, 255, 106);
    z-index: 12;
    border-radius: 100px 100px 10px 10px;
}
 @media only screen and (max-width :385px){
     .clock{
        width: 270px;
        height: 270px;
     }
     footer{
         font-size: 0.9rem;
     }
 }
 @media only screen and (max-width :300px){
     footer{
         font-size: 0.7rem;
     }
 }