Loading {
  height: 25%
  display: flex
  align-items: center
  justify-content: center

  -inline {
    height: 16px
    width: 16px
    display: inline-block
    margin: -3px 3px

    ::before {
      display: block
      height: 16px
      width: 16px
    }
  }

  -small {
    ::before {
      height: 30px
      width: 30px
    }
  }

  -large {
    ::before {
      height: 100px
      width: 100px
    }
    ::after {
      color: #CCC;
      content: 'Loading...'
      font-size: 200%
    }
  }

  ::before {
    content: ' '
    height: 50px
    width: 50px
    background-image: svg(waitingIcon)
    background-repeat: no-repeat
    background-position: center
    background-size: contain
    animation: spin 3s infinite linear
  }
}

@svg waitingIcon {
  width: 30px
  height: 30px
  content: "<circle cx='15' cy='15' r='10' /><circle cx='10' cy='10' r='2' /><circle cx='20' cy='20' r='3' />"

  circle {
    stroke: #CCC
    stroke-width: 3px
    fill: none
  }
}

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