.loader {
    position: fixed;
    z-index: 99;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #fff;
    opacity: 0.6;
    filter: alpha(opacity=60); /* For IE8 and earlier */
    display: flex;
    justify-content: center;
    align-items: center;
}

.loader > img {
    width: 30%;
}

.loader.hidden {
    animation: fadeOut 1s;
    animation-fill-mode: forwards;
}

@keyframes fadeOut {
    100% {
        opacity: 0;
        visibility: hidden;
    }
}

/*
@media 
  (min-width: 375px) and (max-width: 400px),
  (min-width: 468px),
  (-webkit-min-device-pixel-ratio: 2), 
  (min-resolution: 192dpi) {
    .loader > img {
        width: auto;
    }
}*/