style.css

*{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}

html, body {
    display: grid;
    height: 100%;
    place-items: center;
    background: #000;
}

.wrapper{
    height: 100px;
    width: 360px;
    cursor: default;
    background: linear-gradient(135deg, #14ffe9 , #ffeb3b , #ff00e0);
    border-radius: 10px;  
    animation: animate 1.5s linear infinite;
}

.wrapper .display,
.wrapper span{
    position: absolute;
    top: 50%;
    Left: 50%;
    transform: translate(-50% , -50%);
}

.wrapper .display {
    z-index: 999;
    background: #1b1b1b;
    height: 85px;
    width: 345px;
    border-radius: 6px;
    text-align: center;
}

.wrapper .display #time{
    line-height: 85px;
    font-size: 50px;
    font-weight: 600;
    letter-spacing: 1px;
    background: linear-gradient(135deg , #14ffe9, #ffeb3b, #ff00e0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: animate 1.5s linear infinite;
}

@keyframes animate{
    100%{
        filter: hue-rotate(360deg);
    }
}

.wrapper span {
    height: 100%;
    width: 100%;
    background: inherit;
    border-radius: 10px;
}

.wrapper span:first-child {
    filter: blur(10px);
}

.wrapper span:last-child {
    filter: blur(20px);
}