How to center image in the specific div according to current viewport position?

Question

I am trying create nice animation during loading content using ajax. I want to use display icon during reloading div with \"Content\", however I can\'t figured out is it possibl

Answer 1

.loading #img_loading {
    position: fixed;
    top: 50%;
    left: calc(50% + 55px);
    display: block;
}

The above will solve the half of the problem, you need to update the left dynamically with javascript.