.progress-bg{
    position: absolute;
    width: 0%;
    height: 100%;
    background-color: #000000;
    z-index: 1;
    animation: progress 5s cubic-bezier(0.445, 0.05, 0.55, 0.95) forwards;
}
@keyframes progress{
    0%{
        width: 0%;
    }
    100%{
        width: 100%;
    }
}