.card {
    position: relative;
}

@property --angle {
    syntax: '<angle>';
    inherits: false;
    initial-value: 0deg;
}

.card::after, .card::before {
    content: '';
    position: absolute;
    height: 100%;
    width: 100%;
    background-image: conic-gradient(from var(--angle), #ff4545, #00ff99, #006aff, #ff0095, #ff4545);
    top: 50%;
    left: 50%;
    translate: -50% -50%;
    z-index: -1;
    padding: 3px;
    border-radius: 10px;
    animation: 4s spin linear infinite;
}
.card::before {
    filter: blur(1.5rem);
    opacity: 0.5;
}
@keyframes spin {
    from {
        --angle: 0deg;
    }
    to {
        --angle: 360deg;
    }
}