@keyframes hideLoader {
    0% {
        width: 100%;
        height: 100%;
    }

    100% {
        width: 0;
        height: 0;
    }
}

body > div.loader {
    position: fixed;
    background: white;
    width: 100%;
    height: 100%;
    z-index: 9999999;
    opacity: 0;
    transition: opacity .5s ease .25s;
    overflow: hidden;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

body:not(.loaded) > div.loader {
    opacity: 1;
}

body:not(.loaded) {
    overflow: hidden;
}

body.loaded > div.loader {
    animation: hideLoader .5s linear .75s forwards;
}