body {
    margin : 0px;
    overflow: hidden;
}

.arjs-loader {
    position: absolute;
    height: 20%;
    width: 50%;
    top: 40%;
    left: 25%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 5;
    display: flex;
    justify-content: center;
    align-items: center;
}
.arjs-loader div {
    text-align: center;
    font-family: arial;
    font-size: 1.25em;
    color: white;
    z-index: 5;
}