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<svg class="circular" viewbox="25 25 50 50">
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  <circle class="path" cx="50" cy="50" r="20" fill="none" />
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</svg>

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.circular {
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  width: 100px;
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  height: 100px;
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  animation: rotate 2s linear infinite;
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}
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.path {
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  stroke-dasharray: 1, 200;
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  stroke-dashoffset: 0;
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  stroke: #000;
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  animation: dash 1.5s ease-in-out infinite;
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}
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@keyframes rotate {
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  100% {
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    transform: rotate(360deg);
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  }
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}
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@keyframes dash {
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  0% {
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    stroke-dasharray: 1, 200;
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    stroke-dashoffset: 0;
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  }
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  50% {
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    stroke-dasharray: 89, 200;
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    stroke-dashoffset: -[-35px];
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  }
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  100% {
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    stroke-dasharray: 89, 200;
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    stroke-dashoffset: -[-124px];
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  }
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}