.sk-double-bounce {
  top: 50%;
  width: 40px;
  height: 40px;
  position: relative;
  margin: auto;
}

.double-bounce1 {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  opacity: 0.6;
  position: absolute;
  top: 0;
  left: 0;
  -webkit-animation: sk-bounce 2.0s infinite ease-in-out;
  animation: sk-bounce 2.0s infinite ease-in-out;
}

.double-bounce2 {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  opacity: 0.6;
  position: absolute;
  top: 0;
  left: 0;
  -webkit-animation: sk-bounce 2.0s infinite ease-in-out;
  animation: sk-bounce 2.0s infinite ease-in-out;
  -webkit-animation-delay: -1.0s;
  animation-delay: -1.0s;
}

@-webkit-keyframes sk-bounce {
  0%, 100% {
    -webkit-transform: scale(0);
  }

  50% {
    -webkit-transform: scale(1);
  }
}


@keyframes sk-bounce {
  0%, 100% {
    transform: scale(0);
    -webkit-transform: scale(0);
  }

  50% {
    transform: scale(1);
    -webkit-transform: scale(1);
  }
}
