.overlay{
 background:#000;
 opacity:0.5;
 position:fixed;
 z-index:1000;
 width:100%;
 height:100%;

}
.popup{
 z-index:2;
  position: absolute;
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    top:50%;
}

.sk-wave {
  margin: 40px auto;
  width: 50px;
  height: 40px;
  text-align: center;
  font-size: 10px; }
  .sk-wave .sk-rect {
    background-color: #fff;
    height: 100%;
    width: 6px;
    display: inline-block;
    -webkit-animation: sk-waveStretchDelay 1.2s infinite ease-in-out;
            animation: sk-waveStretchDelay 1.2s infinite ease-in-out; }
  .sk-wave .sk-rect1 {
    -webkit-animation-delay: -1.2s;
            animation-delay: -1.2s; }
  .sk-wave .sk-rect2 {
    -webkit-animation-delay: -1.1s;
            animation-delay: -1.1s; }
  .sk-wave .sk-rect3 {
    -webkit-animation-delay: -1s;
            animation-delay: -1s; }
  .sk-wave .sk-rect4 {
    -webkit-animation-delay: -0.9s;
            animation-delay: -0.9s; }
  .sk-wave .sk-rect5 {
    -webkit-animation-delay: -0.8s;
            animation-delay: -0.8s; }

@-webkit-keyframes sk-waveStretchDelay {
  0%, 40%, 100% {
    -webkit-transform: scaleY(0.4);
            transform: scaleY(0.4); }
  20% {
    -webkit-transform: scaleY(1);
            transform: scaleY(1); } }

@keyframes sk-waveStretchDelay {
  0%, 40%, 100% {
    -webkit-transform: scaleY(0.4);
            transform: scaleY(0.4); }
  20% {
    -webkit-transform: scaleY(1);
            transform: scaleY(1); } }

.material-icons {

    color: #fff;
}