#loading {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    z-index: 9999999;
    background: rgba(255, 255, 255, 0.7) url('../img/loader.gif') no-repeat center center;
}

/* Write your custom CSS here */
.zoom_img:hover {
    transform: scale(3.5); /* (250% zoom - Note: if the zoom is too large, it will go outside of the viewport) */
}