Loading spinner with CSS

index.html

<div id="loading"><div id="spinner"></div> <span>Loading...</span></div>

style.scss

@-webkit-keyframes loading {
  to { -webkit-transform: rotate(360deg); }
}
@-moz-keyframes loading {
  to { -moz-transform: rotate(360deg); }
}
@-ms-keyframes loading {
  to { -ms-transform: rotate(360deg); }
}
@keyframes loading {
  to { transform: rotate(360deg); }
}

/* Loader (*/
#loading {
  background: rgba(0,0,0,.7);
  border-radius: 5px;
  display: none;
  margin: -20px 0 0 -65px;
  padding:.5em .75em;
  position: absolute;
  top: 50%;
  left: 50%;
  width:9em;

  #spinner {
    width: 2em;
    height: 2em;
    display:block;
    float:left;
    border-radius: 50%;
    background: transparent;
    border-top: 4px solid #fff;
    border-right: 4px solid #fff;
    border-bottom: 4px solid #777;
    border-left: 4px solid #777;
    -webkit-animation: loading 1.2s infinite linear;
    -moz-animation: loading 1.2s infinite linear;
    -ms-animation: loading 1.2s infinite linear;
    animation: loading 1.2s infinite linear;
  }

  span {
    margin-left: .5em;
    line-height: 175%
  }
}