.spanner {
   position: absolute;
   top: 50%;
   left: 0;
   background: #2a2a2a55;
   width: 100%;
   display: block;
   text-align: center;
   height: 300px;
   color: #FFF;
   transform: translateY(-50%);
   z-index: 1000;
   visibility: hidden;
  }

  .overlay {
   position: fixed;
   width: 100%;
   height: 100%;
   background: rgba(0, 0, 0, 0.5);
   visibility: hidden;
  }

  .loader,
  .loader:before,
  .loader:after {
   border-radius: 50%;
   width: 2.5em;
   height: 2.5em;
   -webkit-animation-fill-mode: both;
   animation-fill-mode: both;
   -webkit-animation: load7 1.8s infinite ease-in-out;
   animation: load7 1.8s infinite ease-in-out;
  }

  .loader {
   color: #ffffff;
   font-size: 10px;
   margin: 80px auto;
   position: relative;
   text-indent: -9999em;
   -webkit-transform: translateZ(0);
   -ms-transform: translateZ(0);
   transform: translateZ(0);
   -webkit-animation-delay: -0.16s;
   animation-delay: -0.16s;
  }

  .loader:before,
  .loader:after {
   content: '';
   position: absolute;
   top: 0;
  }

  .loader:before {
   left: -3.5em;
   -webkit-animation-delay: -0.32s;
   animation-delay: -0.32s;
  }

  .loader:after {
   left: 3.5em;
  }

  @-webkit-keyframes load7 {
   0%,
   80%,
   100% {
    box-shadow: 0 2.5em 0 -1.3em;
   }
   40% {
    box-shadow: 0 2.5em 0 0;
   }
  }

  @keyframes load7 {
   0%,
   80%,
   100% {
    box-shadow: 0 2.5em 0 -1.3em;
   }
   40% {
    box-shadow: 0 2.5em 0 0;
   }
  }

  .show {
   visibility: visible;
  }

  .spanner, .overlay {
   opacity: 0;
   -webkit-transition: all 0.3s;
   -moz-transition: all 0.3s;
   transition: all 0.3s;
  }

  .spanner.show, .overlay.show {
   opacity: 1
  }