@keyframes rotate {
    100% {
        transform: rotate(1turn);
    }
}
 .justwow {
    position: relative;
    z-index: 0;
    width: 350px;
    height: 350px;
    border-radius: 10px;
    overflow: hidden;
    padding: 2rem;
    
    &::before {
        content: '';
        position: absolute;
        z-index: -2;
        left: -50%;
        top: -50%;
        width: 200%;
        height: 200%;
        background-color: #399953;
        background-repeat: no-repeat;
        background-size: 50% 50%, 50% 50%;
        background-position: 0 0, 100% 0, 100% 100%, 0 100%;
        background-image: linear-gradient(#399953, #399953), linear-gradient(#fbb300, #fbb300), linear-gradient(#d53e33, #d53e33), linear-gradient(#377af5, #377af5);
        animation: rotate 4s linear infinite;
    }
    
    &::after {
        content: '';
        position: absolute;
        z-index: -1;
        left: 6px;
        top: 6px;
        width: calc(100% - 12px);
        height: calc(100% - 12px);
        background: white;
        border-radius: 5px;
        animation: opacityChange 3s infinite alternate;
    }
}

@keyframes opacityChange {
    50% {
        opacity:1;
    }
    100% {
        opacity: .5;
    }
}