*,
*:before,
*:after{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body{
    background-color: #151320;
}
.cls-rainbow-div{
    height: 250px;
    width: 250px;
    position: absolute;
    transform: translate(-50%,-50%);
    top: 50%;
    left: 50%;
    border-radius: 5px;
    box-shadow: 0 20px 35px rgba(0,0,0,0.3);
    overflow: hidden;
}
.cls-rainbow-div:before{
    content: "";
    height: 150%;
    width: 150%;
    position: absolute;
    background: conic-gradient(
        #fd004c,
        #fe9000,
        #fff020,
        #3edf4b,
        #3363ff,
        #b102b7,
        #fd004c
    );
    left: -25%;
    top: -25%;
    animation: spin 1.5s infinite linear;
}
@keyframes spin{
    100%{
        transform: rotate(-360deg);
    }
}
.cls-inside-div{
    position: absolute;
    background-color: #1c1b29;
    height: 93%;
    width: 93%;
    top: 3.5%;
    left: 3.5%;
    border-radius: 5px;
    font-family: 'Poppins',sans-serif;
    color: #ffffff;
    font-size: 20px;
    letter-spacing: 6px;
    display: grid;
    place-items: center;
}