<body>
  Conteúdo normal da página
  <button onclick="document.body.className = 'loading'; return false;">Load na página</button>
  <div id=mydiv>
    div com conteúdo
    <button onclick="document.getElementById('mydiv').className = 'loading'; return false;">Load só no div</button>
  </div>
</body>
#mydiv{
  min-height:4em;
  border:solid 1px;
  padding:.5em;
  margin:.5em 0;
}

@-moz-keyframes loading-anim {
  0%,
  60% {
    opacity: 0;
  }
  100% {
    opacity: 0.4;
  }
}
@-webkit-keyframes loading-anim {
  0%,
  60% {
    opacity: 0;
  }
  100% {
    opacity: 0.4;
  }
}
@keyframes loading-anim {
  0%,
  60% {
    opacity: 0;
  }
  100% {
    opacity: 0.4;
  }
}

.loading{
  cursor:wait;
  pointer-events:none;
}

body .loading{
  position:relative;
}

body.loading:after{
  position:fixed;
  max-width:100vw;
  max-height:100vh;
}

.loading:after {
    opacity: 0.6;
  -moz-animation: loading-anim 2s ease-in-out;
  -o-animation: loading-anim 2s ease-in-out;
  -webkit-animation: loading-anim 2s ease-in-out;
  animation: loading-anim 2s ease-in-out;
    pointer-events:auto;
    content: "";
    cursor: wait;
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,.7) 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") no-repeat center center;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.