@mixin loading {
  -webkit-animation: anim-loader-inner 1s infinite linear;
  animation: anim-loader-inner 1s infinite linear;
  background: transparent url('../img/powerups/Quad.png') no-repeat;
  height: 64px;
  left: 50%;
  margin-left: -32px;
  margin-top: -32px;
  position: absolute;
  -webkit-transform: translateZ(0);
  -ms-transform: translateZ(0);
  transform: translateZ(0);
  top: 50%;
  width: 64px;

  @-webkit-keyframes anim-loader-inner {
    0% {
      -webkit-transform: rotate(0deg);
      transform: rotate(0deg);
    }
    100% {
      -webkit-transform: rotate(360deg);
      transform: rotate(360deg);
    }
  }
  @keyframes anim-loader-inner {
    0% {
      -webkit-transform: rotate(0deg);
      transform: rotate(0deg);
    }
    100% {
      -webkit-transform: rotate(360deg);
      transform: rotate(360deg);
    }
  }
}