div on top and center html css code example

Example 1: center div in middle of page

.centered {
  position: fixed;
  top: 50%;
  left: 50%;
  /* bring your own prefixes */
  transform: translate(-50%, -50%);
}

Example 2: how to center a position fixed element horizontally

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