position fixed in the middle code example

Example 1: how to middle fixed element

position: fixed;
	top: 0;
	z-index: 100;
	left: 50%;
	transform: translateX(-50%);

Example 2: how to center with position fixed

position: fixed;
width: 500px;
height: 200px;
margin: 5% auto; /* Will not center vertically and won't work in IE6/7. */
left: 0;
right: 0;