how to make a fixed element center vertically and horizontally code example

Example 1: vertically and horizontally center a fixed div

// you dont need to know the divs dimensions and it does not require any container divs
position: fixed; 
top: 50%;
left: 50%;
transform: translate(-50%, -50%);

Example 2: center a fixed div horizontally

left: 50%;
transform: translateX(-50%);