.side-menu{

    position:fixed;

    top:0;

    left:0;

    width:380px;

    height:100vh;

    background:white;

    transform:translateX(-100%);

    transition:.35s;

    z-index:9999;

    padding:60px;

}

.side-menu.open{

    transform:translateX(0);

}

.menu-overlay{

    position:fixed;

    inset:0;

    background:rgba(0,0,0,.25);

    opacity:0;

    visibility:hidden;

    transition:.35s;

    z-index:9998;

}

.menu-overlay.open{

    opacity:1;

    visibility:visible;

}