templates/common/root/app/styles/_site-loading.scss
.site-loading
{
position: fixed;
width: 100%;
height: 100%;
background: #eeeeee;
.spinner {
position: absolute;
top: 50%;
left: 50%;
height: 32px;
width: 32px;
margin-top: 32px/2;
margin-left: 32px/2;
background: {
image: url('../assets/images/site-loading.gif');
repeat: no-repeat;
position: center;
}
}
}