htmlcsscentering

CSS horizontal centering of a fixed div?

#menu {
    position: fixed;
    width: 800px;
    background: rgb(255, 255, 255); /* The Fallback */
    background: rgba(255, 255, 255, 0.8);
    margin-top: 30px;
}

I know this question is a million times out there, however I can't find a solution to my case. I've got a div, which should be fixed on the screen, even if the page is scrolled it should always stay CENTERED in the middle of the screen!

The div should have 500px width, should be 30px away from the top (margin-top), should be horizontally centered in the middle of the page for all browser sizes and should not move when scrolling the rest of the page.

Is that possible?

Solution 
  • left: 50%;
margin-left: -400px; /* Half of the width */