CSS: Position loading indicator in the center of the screen

use position:fixed instead of position:absolute

The first one is relative to your screen window. (not affected by scrolling)

The second one is relative to the page. (affected by scrolling)

Note : IE6 doesn't support position:fixed.

.loader{
  position: fixed;
  left: 0px;
  top: 0px;
  width: 100%;
  height: 100%;
  z-index: 9999;
  background: url('//upload.wikimedia.org/wikipedia/commons/thumb/e/e5/Phi_fenomeni.gif/50px-Phi_fenomeni.gif') 
              50% 50% no-repeat rgb(249,249,249);
}

<div class="loader"></div>

This is what I've done for Angular 4:

<style type="text/css">  
  .centered {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transform: -webkit-translate(-50%, -50%);
    transform: -moz-translate(-50%, -50%);
    transform: -ms-translate(-50%, -50%);
    color:darkred;
  }
</style>

</head>

<body>
  <app-root>
        <div class="centered">
          <h1>Loading...</h1>
        </div>
  </app-root>
</body>

CSS: Position loading indicator in the center of the screen

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