.pace .pace-activity:before {
  content: '';
  background-color: #fff;
  background-image: url('../images/loader.gif');
  background-repeat: no-repeat;
  background-position: center center;
  background-size: 200px 200px;
  display: block;
  z-index: 900;
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-transition: all 1s;
  -moz-transition: all 1s;
  -o-transition: all 1s;
  transition: all 1s;
}