/* https://cssloaders.github.io/ */

.spinner {
  display: block;
  color: #000000;
  font-size: 3.5rem;
  text-indent: -9999em;
  overflow: hidden;
  margin: 2rem auto;
  width: 1em;
  height: 1em;
  border-radius: 50%;
  position: relative;
  transform: translateZ(0);
  animation: mltShdSpin 1.7s infinite ease, round 1.7s infinite ease;
  opacity: 1;
  transition: opacity 0.5s ease, display 0.5s ease allow-discrete;
  &.hidden {
    display: none;
    opacity: 0;
  }
}

.spinner.big {
  font-size: 5rem;
}

@keyframes mltShdSpin {
  0% {
    box-shadow: 0 -0.83em 0 -0.4em,
    0 -0.83em 0 -0.42em, 0 -0.83em 0 -0.44em,
    0 -0.83em 0 -0.46em, 0 -0.83em 0 -0.477em;
  }
  5%,
  95% {
    box-shadow: 0 -0.83em 0 -0.4em, 
    0 -0.83em 0 -0.42em, 0 -0.83em 0 -0.44em, 
    0 -0.83em 0 -0.46em, 0 -0.83em 0 -0.477em;
  }
  10%,
  59% {
    box-shadow: 0 -0.83em 0 -0.4em, 
    -0.087em -0.825em 0 -0.42em, -0.173em -0.812em 0 -0.44em, 
    -0.256em -0.789em 0 -0.46em, -0.297em -0.775em 0 -0.477em;
  }
  20% {
    box-shadow: 0 -0.83em 0 -0.4em, -0.338em -0.758em 0 -0.42em,
     -0.555em -0.617em 0 -0.44em, -0.671em -0.488em 0 -0.46em, 
     -0.749em -0.34em 0 -0.477em;
  }
  38% {
    box-shadow: 0 -0.83em 0 -0.4em, -0.377em -0.74em 0 -0.42em,
     -0.645em -0.522em 0 -0.44em, -0.775em -0.297em 0 -0.46em, 
     -0.82em -0.09em 0 -0.477em;
  }
  100% {
    box-shadow: 0 -0.83em 0 -0.4em, 0 -0.83em 0 -0.42em, 
    0 -0.83em 0 -0.44em, 0 -0.83em 0 -0.46em, 0 -0.83em 0 -0.477em;
  }
}

@keyframes round {
  0% { transform: rotate(0deg) }
  100% { transform: rotate(360deg) }
}