Mailspring/static/components/spinner.less

@import "ui-variables";

.spinner {
  margin: 0;
  width: 94px;
  text-align: center;
  opacity: 1;
  -webkit-transition: opacity 0.2s linear; //transition
}

.spinner.hidden {
  opacity: 0;
}
.spinner.paused {
  > div {
    // important. animating with opacity 0 chews up about 5% cpu
    -webkit-animation-play-state: paused;
    animation-play-state: paused;
  }
}

.spinner > div {
  width: 18px;
  height: 18px;
  background-color: @gray-light;

  border-radius: 100%;
  display: inline-block;
  -webkit-animation: bouncedelay 1.2s infinite ease-in-out;
  animation: bouncedelay 1.2s infinite ease-in-out;
  /* Prevent first frame from flickering when animation starts */
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  margin-right:4px;
  margin-left:4px;
}

.spinner .bounce1 {
  -webkit-animation-delay: -0.32s;
  animation-delay: -0.32s;
}

.spinner .bounce2 {
  -webkit-animation-delay: -0.16s;
  animation-delay: -0.16s;
}

@-webkit-keyframes bouncedelay {
  0%, 80%, 100% { -webkit-transform: scale(0.0) }
  40% { -webkit-transform: scale(1.0) }
}

@keyframes bouncedelay {
  0%, 80%, 100% { 
    transform: scale(0.0);
    -webkit-transform: scale(0.0);
  } 40% { 
    transform: scale(1.0);
    -webkit-transform: scale(1.0);
  }
}