*
{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body
{
    width: 100%;
    height: 100%;
}

.loading-overlay
{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: white;
}

.loading-overlay img
{
    position: absolute;
    top: 50%;
    left: 50%;
    width: 50px;
    height: 50px;
    margin: -25px 0 0 -25px;
}