<div class="loader">
    <svg viewBox="0 0 80 80">
        <circle id="test" cx="40" cy="40" r="32"></circle>
    </svg>
</div>

<div class="loader triangle">
    <svg viewBox="0 0 86 80">
        <polygon points="43 8 79 72 7 72"></polygon>
    </svg>
</div>

<div class="loader">
    <svg viewBox="0 0 80 80">
        <rect x="8" y="8" width="64" height="64"></rect>
    </svg>
</div>
*{
  box-sizing:border-box;
  margin:0;
  padding:0;
}
html,
body {
  height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  background-color: #e8e8e8;
  font-family:arial;
}
.loader {
  --path: #2f3545;
  --dot: #5628ee;
  --duration: 3s;
  width: 44px;
  height: 44px;
  position: relative;
}

.loader:before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  position: absolute;
  display: block;
  background: var(--dot);
  top: 37px;
  left: 19px;
  transform: translate(-18px, -18px);
  animation: dotRect var(--duration) cubic-bezier(0.785, 0.135, 0.15, 0.86) infinite;
}

.loader svg {
  display: block;
  width: 100%;
  height: 100%;
}

.loader svg rect, .loader svg polygon, .loader svg circle {
  fill: none;
  stroke: var(--path);
  stroke-width: 10px;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.loader svg polygon {
  stroke-dasharray: 145 76 145 76;
  stroke-dashoffset: 0;
  animation: pathTriangle var(--duration) cubic-bezier(0.785, 0.135, 0.15, 0.86) infinite;
}

.loader svg rect {
  stroke-dasharray: 192 64 192 64;
  stroke-dashoffset: 0;
  animation: pathRect 3s cubic-bezier(0.785, 0.135, 0.15, 0.86) infinite;
}

.loader svg circle {
  stroke-dasharray: 150 50 150 50;
  stroke-dashoffset: 75;
  animation: pathCircle var(--duration) cubic-bezier(0.785, 0.135, 0.15, 0.86) infinite;
}

.loader.triangle {
  width: 48px;
}

.loader.triangle:before {
  left: 21px;
  transform: translate(-10px, -18px);
  animation: dotTriangle var(--duration) cubic-bezier(0.785, 0.135, 0.15, 0.86) infinite;
}

@keyframes pathTriangle {
  33% {
    stroke-dashoffset: 74;
  }

  66% {
    stroke-dashoffset: 147;
  }

  100% {
    stroke-dashoffset: 221;
  }
}

@keyframes dotTriangle {
  33% {
    transform: translate(0, 0);
  }

  66% {
    transform: translate(10px, -18px);
  }

  100% {
    transform: translate(-10px, -18px);
  }
}

@keyframes pathRect {
  25% {
    stroke-dashoffset: 64;
  }

  50% {
    stroke-dashoffset: 128;
  }

  75% {
    stroke-dashoffset: 192;
  }

  100% {
    stroke-dashoffset: 256;
  }
}

@keyframes dotRect {
  25% {
    transform: translate(0, 0);
  }

  50% {
    transform: translate(18px, -18px);
  }

  75% {
    transform: translate(0, -36px);
  }

  100% {
    transform: translate(-18px, -18px);
  }
}

@keyframes pathCircle {
  25% {
    stroke-dashoffset: 125;
  }

  50% {
    stroke-dashoffset: 175;
  }

  75% {
    stroke-dashoffset: 225;
  }

  100% {
    stroke-dashoffset: 275;
  }
}

.loader {
  display: inline-block;
  margin: 0 16px;
}
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