<div class="container">
  <span class="spinner-double-dot-in"></span>
  <span class="spinner-dot-in"></span>
  <span class="spinner-double-dot-stick"></span>
  <span class="spinner-dot-stick"></span>
  <span class="spinner-double-dot-out"></span>
  <span class="spinner-dot-out"></span>

  <span class="spinner-wave-in"></span>
  <span class="spinner-double-wave-in"></span>
  <span class="spinner-huge-wave-in"></span>
  <span class="spinner-wave-out"></span>
  <span class="spinner-double-wave-out"></span>
  <span class="spinner-huge-wave-out"></span>

  <span class="spinner-double-section-in"></span>
  <span class="spinner-section-in"></span>
  <span class="spinner-double-section"></span>
  <span class="spinner-section"></span>
  <span class="spinner-double-section-out"></span>
  <span class="spinner-section-out"></span>
  <span class="spinner-double-section-far"></span>
  <span class="spinner-section-far"></span>
</div>

$inactive: #aaa;
$active: tomato;
$speed: 1.2s;
$size: 50px;
$unit: $size / 16;

%spinner {  
  display: block;
  float: left;
  width: $size;
  height: $size;
  border-radius: 50%;
  border: $unit solid $inactive;
  animation: spinner $speed linear infinite;
}
@keyframes spinner {
  0% { transform: rotate(0); }
  100% { transform: rotate(360deg); }
}

/* Dots */
%spinner-double-dot-in,
.spinner-double-dot-in {
  @extend %spinner;
  position: relative;
  
  &:before,
  &:after {
    content: '';
    position: absolute;
    top: ($unit*2);
    left: ($size/2 -$unit);
    width: ($unit*2);
    height: ($unit*2);
    border-radius: 50%;
    background: $active;
  }
  &:after {
    top: auto;
    bottom: ($unit*2);
  }
}
%spinner-dot-in,
.spinner-dot-in {
  @extend %spinner-double-dot-in;
  
  &:after {
    display: none;
  }
}
%spinner-double-dot-stick,
.spinner-double-dot-stick {
  @extend %spinner-double-dot-in;
  
  &:before,
  &:after {
    top: (-$unit*2);
  }
  &:after {
    top: auto;
    bottom: (-$unit*2);
  }
}
%spinner-dot-stick,
.spinner-dot-stick {
  @extend %spinner-double-dot-stick;
  
  &:after {
    display: none;
  }
}
%spinner-double-dot-out,
.spinner-double-dot-out {
  @extend %spinner-double-dot-in;
  
  &:before,
  &:after {
    top: (-$unit*4);
  }
  &:after {
    top: auto;
    bottom: (-$unit*4);
  }
}
%spinner-dot-out,
.spinner-dot-out {
  @extend %spinner-double-dot-out;
  
  &:after {
    display: none;
  }
}

/* Waves */

%spinner-wave-out,
.spinner-wave-out {
  @extend %spinner;
  box-shadow: (-$unit/2) (-$unit/2) 0 ($unit/2) $active; 
}
%spinner-wave-in,
.spinner-wave-in {
  @extend %spinner;
  box-shadow: inset (-$unit/2) (-$unit/2) 0 ($unit/2) $active;
}
%spinner-double-wave-out,
.spinner-double-wave-out {
  @extend %spinner;
  box-shadow: (-$unit/2) (-$unit/2) 0 ($unit/2) $active,
              ($unit/2) ($unit/2) 0 ($unit/2) $active; 
}
%spinner-double-wave-in,
.spinner-double-wave-in {
  @extend %spinner;
  box-shadow: inset (-$unit/2) (-$unit/2) 0 ($unit/2) $active,
              inset ($unit/2) ($unit/2) 0 ($unit/2) $active;
}

%spinner-huge-wave-out,
.spinner-huge-wave-out {
  @extend %spinner;
  box-shadow: (-$unit/2) (-$unit/2) 0 ($unit*2) $active;
}
%spinner-huge-wave-in,
.spinner-huge-wave-in {
  @extend %spinner;
  box-shadow: inset (-$unit/2) (-$unit/2) 0 ($unit*2) $active;
}

/* Sections */
%spinner-double-section,
.spinner-double-section {
  @extend %spinner;
  position: relative;
  
  &:before,
  &:after {
    content: '';
    position: absolute;
    top: -$unit;
    left: -$unit;
    display: block;
    width: $size;
    height: $size;
    border-radius: 50%;
    border: $unit solid transparent;
    border-top-color: $active;
  }
  &:after {
    border-top-color: transparent;
    border-bottom-color: $active;
  }
}
%spinner-section,
.spinner-section {
  @extend %spinner-double-section;
  
  &:after {
    display: none;
  }
}
%spinner-double-section-in,
.spinner-double-section-in {
  @extend %spinner-double-section;
  
  &:before,
  &:after {
    top: 0;
    left: 0;
    width: ($size - $unit*2);
    height: ($size - $unit*2);
  }
}
%spinner-section-in,
.spinner-section-in {
  @extend %spinner-double-section-in;
  
  &:after {
    display: none;
  }
}
%spinner-double-section-out,
.spinner-double-section-out {
  @extend %spinner-double-section;
  
  &:before,
  &:after {
    top: ($unit*-2);
    left: ($unit*-2);
    width: ($size + $unit*2);
    height: ($size + $unit*2);
  }
}
%spinner-section-out,
.spinner-section-out {
  @extend %spinner-double-section-out;
  
  &:after {
    display: none;
  }
}
%spinner-double-section-far,
.spinner-double-section-far {
  @extend %spinner-double-section;
  
  &:before,
  &:after {
    top: ($unit*-3);
    left: ($unit*-3);
    width: ($size + $unit*4);
    height: ($size + $unit*4);
  }
}
%spinner-section-far,
.spinner-section-far {
  @extend %spinner-double-section-far;
  
  &:after {
    display: none;
  }
}

/* --- */
$n: 4;
$m: 10px;
body { background: #303030; overflow: hidden; }
.container { width: ($size + $m * 4) * $n; margin: 30px auto; }
span { margin: $m; &:nth-child(#{$n}n+1) { clear: both; } }