.overlay {
  height: 100%;
  width: 100%;
  display: none;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: rgb(0,0,0);
  background-color: rgba(0,0,0, 0.2);
}

.overlay-content {
  position: relative;
  top: 25%;
  width: 100%;
  text-align: center;
  margin-top: 30px;
}

.overlay a {
  padding: 8px;
  text-decoration: none;
  font-size: 36px;
  color: #818181;
  display: block;
  transition: 0.3s;
}

  .overlay a:hover, .overlay a:focus {
    color: #f1f1f1;
  }

.overlay .closebtn {
  position: absolute;
  top: 20px;
  right: 45px;
  font-size: 60px;
}

@media screen and (max-height: 450px) {
  .overlay a {
    font-size: 20px
  }

  .overlay .closebtn {
    font-size: 40px;
    top: 15px;
    right: 35px;
  }
}

.spinner {
  position: absolute;
  left: 50%;
  top: 50%;
  height: 60px;
  width: 60px;
  margin: 0px auto;
  -webkit-animation: rotation .6s infinite linear;
  -moz-animation: rotation .6s infinite linear;
  -o-animation: rotation .6s infinite linear;
  animation: rotation .6s infinite linear;
  border-left: 6px solid rgba(0,174,239,.15);
  border-right: 6px solid rgba(0,174,239,.15);
  border-bottom: 6px solid rgba(0,174,239,.15);
  border-top: 6px solid rgba(0,174,239,.8);
  border-radius: 100%;
}

@-webkit-keyframes rotation {
  from {
    -webkit-transform: rotate(0deg);
  }

  to {
    -webkit-transform: rotate(359deg);
  }
}

@-moz-keyframes rotation {
  from {
    -moz-transform: rotate(0deg);
  }

  to {
    -moz-transform: rotate(359deg);
  }
}

@-o-keyframes rotation {
  from {
    -o-transform: rotate(0deg);
  }

  to {
    -o-transform: rotate(359deg);
  }
}

@keyframes rotation {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(359deg);
  }
}