.container {
  margin-top: 40px;
}
.block {
  border-radius: 8px;
  cursor: pointer;
  padding-top: 16px;
  text-align: center;
  background: #f9f9f9;
  outline: 1px solid #fff;
}
.block.selected, .block.selected:hover {
  background: #0069d9;
  color: white;
}
.block:hover {
  background: #dfd;
}

/* loading */
#loading {
  position: absolute;
  width: 100%;
  height: 100%;
  background: white;
  top: 0;
  opacity: .95;
}

.sk-cube-grid {
  width: 120px;
  height: 120px;
  margin: calc(40vh) auto 0;
}

.sk-cube-grid .sk-cube {
  width: 33%;
  height: 33%;
  background-color: #0069d9;
  float: left;
  -webkit-animation: sk-cubeGridScaleDelay 1.3s infinite ease-in-out;
  animation: sk-cubeGridScaleDelay 1.3s infinite ease-in-out;
}

.sk-cube-grid .sk-cube1 {
  -webkit-animation-delay: 0.2s;
  animation-delay: 0.2s;
}

.sk-cube-grid .sk-cube2 {
  -webkit-animation-delay: 0.3s;
  animation-delay: 0.3s;
}

.sk-cube-grid .sk-cube3 {
  -webkit-animation-delay: 0.4s;
  animation-delay: 0.4s;
}

.sk-cube-grid .sk-cube4 {
  -webkit-animation-delay: 0.1s;
  animation-delay: 0.1s;
}

.sk-cube-grid .sk-cube5 {
  -webkit-animation-delay: 0.2s;
  animation-delay: 0.2s;
}

.sk-cube-grid .sk-cube6 {
  -webkit-animation-delay: 0.3s;
  animation-delay: 0.3s;
}

.sk-cube-grid .sk-cube7 {
  -webkit-animation-delay: 0s;
  animation-delay: 0s;
}

.sk-cube-grid .sk-cube8 {
  -webkit-animation-delay: 0.1s;
  animation-delay: 0.1s;
}

.sk-cube-grid .sk-cube9 {
  -webkit-animation-delay: 0.2s;
  animation-delay: 0.2s;
}

@-webkit-keyframes sk-cubeGridScaleDelay {
  0%, 70%, 100% {
      -webkit-transform: scale3D(1, 1, 1);
      transform: scale3D(1, 1, 1);
  }
  35% {
      -webkit-transform: scale3D(0, 0, 1);
      transform: scale3D(0, 0, 1);
  }
}

@keyframes sk-cubeGridScaleDelay {
  0%, 70%, 100% {
      -webkit-transform: scale3D(1, 1, 1);
      transform: scale3D(1, 1, 1);
  }
  35% {
      -webkit-transform: scale3D(0, 0, 1);
      transform: scale3D(0, 0, 1);
  }
}