button {
  margin: 1px;
}

/* Inspired by: m3.material.io/components/progress-indicators/overview */

.loader {
    width: 48px;
    /* Subpixels get cut off */
    overflow: visible;
    transform: rotate(-90deg);
    transform-origin: center;
  
    --active: #184074;
    --track: #73889F;
  
    --duration: 8s;
  
    animation: spin 2s linear infinite;
}
  
@keyframes spin {
    0% {
      rotate: 0deg;
    }
  
    100% {
      rotate: 360deg;
    }
}
  
.active {
    stroke: var(--active);
    stroke-linecap: round;
    stroke-dashoffset: 360;
    animation: active-animation var(--duration) ease-in-out infinite;
}
  
@keyframes active-animation {
    0% {
      stroke-dasharray: 0 0 0 360 0 360;
    }
    12.5% {
      stroke-dasharray: 0 0 270 90 270 90;
    }
    25% {
      stroke-dasharray: 0 270 0 360 0 360;
    }
    37.5% {
      stroke-dasharray: 0 270 270 90 270 90;
    }
    50% {
      stroke-dasharray: 0 540 0 360 0 360;
    }
    50.001% {
      stroke-dasharray: 0 180 0 360 0 360;
    }
    62.5% {
      stroke-dasharray: 0 180 270 90 270 90;
    }
    75% {
      stroke-dasharray: 0 450 0 360 0 360;
    }
    87.5% {
      stroke-dasharray: 0 450 270 90 270 90;
    }
    87.501% {
      stroke-dasharray: 0 90 270 90 270 90;
    }
    100% {
      stroke-dasharray: 0 360 1 360 0 360;
    }
}
  
.track {
    stroke: var(--track);
    stroke-linecap: round;
    stroke-dashoffset: 360;
    animation: track-animation var(--duration) ease-in-out infinite;
}
  
@keyframes track-animation {
    0% {
      stroke-dasharray: 0 20 320 40 320 40;
    }
    12.5% {
      stroke-dasharray: 0 290 50 310 50 310;
    }
    25% {
      stroke-dasharray: 0 290 320 40 320 40;
    }
    37.5% {
      stroke-dasharray: 0 560 50 310 50 310;
    }
    37.501% {
      stroke-dasharray: 0 200 50 310 50 310;
    }
    50% {
      stroke-dasharray: 0 200 320 40 320 40;
    }
    62.5% {
      stroke-dasharray: 0 470 50 310 50 310;
    }
    62.501% {
      stroke-dasharray: 0 110 50 310 50 310;
    }
    75% {
      stroke-dasharray: 0 110 320 40 320 40;
    }
    87.5% {
      stroke-dasharray: 0 380 50 310 50 310;
    }
    100% {
      stroke-dasharray: 0 380 320 40 320 40;
    }
}