/* 

<div class="dot-spinner">
    <div class="dot-spinner__dot"></div>
    <div class="dot-spinner__dot"></div>
    <div class="dot-spinner__dot"></div>
    <div class="dot-spinner__dot"></div>
    <div class="dot-spinner__dot"></div>
    <div class="dot-spinner__dot"></div>
    <div class="dot-spinner__dot"></div>
    <div class="dot-spinner__dot"></div>
</div>


*/
    
    
.dot-spinner {
    --uib-size: 40px;
    --uib-speed: .9s;
    --uib-color: rgb(0, 0, 0);
  
    position: relative;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    height: var(--uib-size);
    width: var(--uib-size);
  }
  
  .dot-spinner__dot {
    position: absolute;
    top: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    height: 100%;
    width: 100%;
  }
  
  .dot-spinner__dot::before {
    content: '';
    height: 20%;
    width: 20%;
    border-radius: 50%;
    background-color: var(--uib-color);
    transform: scale(0);
    /* opacity: 0.5; */
    animation: pulse calc(var(--uib-speed) * 1.111) ease-in-out infinite;
  }
  
  .dot-spinner__dot:nth-child(2) {
    transform: rotate(45deg);
  }
  
  .dot-spinner__dot:nth-child(2)::before {
    animation-delay: calc(var(--uib-speed) * -0.875);
  }
  
  .dot-spinner__dot:nth-child(3) {
    transform: rotate(90deg);
  }
  
  .dot-spinner__dot:nth-child(3)::before {
    animation-delay: calc(var(--uib-speed) * -0.75);
  }
  
  .dot-spinner__dot:nth-child(4) {
    transform: rotate(135deg);
  }
  
  .dot-spinner__dot:nth-child(4)::before {
    animation-delay: calc(var(--uib-speed) * -0.625);
  }
  
  .dot-spinner__dot:nth-child(5) {
    transform: rotate(180deg);
  }
  
  .dot-spinner__dot:nth-child(5)::before {
    animation-delay: calc(var(--uib-speed) * -0.5);
  }
  
  .dot-spinner__dot:nth-child(6) {
    transform: rotate(225deg);
  }
  
  .dot-spinner__dot:nth-child(6)::before {
    animation-delay: calc(var(--uib-speed) * -0.375);
  }
  
  .dot-spinner__dot:nth-child(7) {
    transform: rotate(270deg);
  }
  
  .dot-spinner__dot:nth-child(7)::before {
    animation-delay: calc(var(--uib-speed) * -0.25);
  }
  
  .dot-spinner__dot:nth-child(8) {
    transform: rotate(315deg);
  }
  
  .dot-spinner__dot:nth-child(8)::before {
    animation-delay: calc(var(--uib-speed) * -0.125);
  }
  
  @keyframes pulse {
    0%,
    100% {
      transform: scale(0);
      opacity: 0.5;
    }
  
    50% {
      transform: scale(1);
      opacity: 1;
    }
  }

/* 

<svg
  class="ring"
  viewBox="25 25 50 50"
  stroke-width="5"
>
  <circle cx="50" cy="50" r="20" />
</svg>

*/

.ring {
    --uib-size: 40px;
    --uib-speed: 2s;
    --uib-color: black;
    
    height: var(--uib-size);
    width: var(--uib-size);
    vertical-align: middle;
    transform-origin: center;
    animation: rotate var(--uib-speed) linear infinite;
  }
  
  .ring circle {
    fill: none;
    stroke: var(--uib-color);
    stroke-dasharray: 1, 200;
    stroke-dashoffset: 0;
    stroke-linecap: round;
    animation: stretch calc(var(--uib-speed) * 0.75) ease-in-out infinite;
  }
  
  @keyframes rotate {
    100% {
      transform: rotate(360deg);
    }
  }
  
  @keyframes stretch {
    0% {
      stroke-dasharray: 1, 200;
      stroke-dashoffset: 0;
    }
    50% {
      stroke-dasharray: 90, 200;
      stroke-dashoffset: -35px;
    }
    100% {
      stroke-dashoffset: -124px;
    }
  }