CSS Spinner Full

HTML

<div id="container" class="crabbly_spinner"></div>

CSS

#container {
  width:100%;
  
  height:100%; 
}
.crabbly_spinner {
  position:relative;
  background-color: rgba(255,255,255,0.8);
}

.crabbly_spinner:after {
position: absolute;
    content: '';
    top: 50%;
    left: 50%;
    margin: -1.5em 0 0 -1.5em;
    width: 3em;
    height: 3em;
    border-radius: 500rem;
    border-color: #767676 rgba(0,0,0,.1) rgba(0,0,0,.1);
    border-style: solid;
    border-width: .2em;
    box-shadow: 0 0 0 1px transparent;
    visibility: visible;
    z-index: 101;
    
    -moz-animation: crabbly_spinner infinite .75s linear;
    -o-animation: crabbly_spinner infinite .75s linear;
    animation: crabbly_spinner infinite .75s linear; 
}

@keyframes crabbly_spinner {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}