#loader { display: none; position: absolute; left: 100px; top: 0; }

.cart_loader {
    display: none;
    position: fixed;
    z-index: 900000;
    height: 2em;
    width: 2em;
    overflow: visible;
    margin: auto;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0
}

.cart_loader:before {
    content: '';
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, .3);
}

.cart_loader:not(:required) {
    font: 0/0 a;
    color: transparent;
    text-shadow: none;
    background-color: transparent;
    border: 0
}

    .cart_loader:not(:required):after {      
        content:url('images/preloader3.svg');       
        display: block;
        background-color: rgba(0, 0, 0, .3);        
    }