.load_page {
    background-color: #FFF;
    position: fixed;
    top: 0;
    right: 0;
    min-width: 100%;
    min-height: 100%;
    z-index: 999;
    text-align: center;
}

.load_page .gif {
    position: absolute;
    top: 35%;
    left: 50%;
    transform: translate(-50%, -50%);
}