.preloader{position:fixed;top:0;left:0;width:100%;height:100%;background:#efefef;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;font-size:24px;z-index:1000;opacity:1;transition:transform 1s ease;transform:translateY(0)}.hidden{transform:translateY(-100%)}