fixed make himself center css code example
Example 1: center a fixed div horizontally
left: 50%;
transform: translateX(-50%);
Example 2: how to center a position fixed element horizontally
left: 50%;
margin-left: -400px; /* Half of the width */
left: 50%;
transform: translateX(-50%);
left: 50%;
margin-left: -400px; /* Half of the width */