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CSS

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HTML 

              
                Pure CSS

<div class="spinner anim-rotate">
  <div class="spinner-inner"></div>
</div>

<br><br>

Original - 16px scaled to 92%

<div style="height:16px; width:16px;" class="mx-auto">
  <svg fill="none" width="92%" height="92%" viewBox="0 0 16 16" class="anim-rotate" xmlns="http://www.w3.org/2000/svg" title="in_progress_icon" aria-hidden="true">
    <path opacity=".5" d="M8 15A7 7 0 108 1a7 7 0 000 14v0z" stroke="#dbab0a" stroke-width="2"></path>
    <path d="M15 8a7 7 0 01-7 7" stroke="#dbab0a" stroke-width="2"></path>
    <path d="M8 12a4 4 0 100-8 4 4 0 000 8z" fill="#dbab0a"></path>
  </svg>
</div>

<br><br>

16px not scaled

<div style="height:16px; width:16px;" class="mx-auto">
  <svg fill="none" viewBox="0 0 16 16" class="anim-rotate" xmlns="http://www.w3.org/2000/svg" title="in_progress_icon" aria-hidden="true">
    <path opacity=".5" d="M8 15A7 7 0 108 1a7 7 0 000 14v0z" stroke="#dbab0a" stroke-width="2"></path>
    <path d="M15 8a7 7 0 01-7 7" stroke="#dbab0a" stroke-width="2"></path>
    <path d="M8 12a4 4 0 100-8 4 4 0 000 8z" fill="#dbab0a"></path>
  </svg>
</div>

<br><br>

Redrawn 14px

<div style="height:16px; width:16px;" class="mx-auto">
  <svg fill="none" width="16" height="16" class="anim-rotate" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" title="in_progress_icon" aria-hidden="true">
    <path opacity="0.5" d="M8 14C9.5913 14 11.1174 13.3679 12.2426 12.2426C13.3679 11.1174 14 9.5913 14 8C14 6.4087 13.3679 4.88258 12.2426 3.75736C11.1174 2.63214 9.5913 2 8 2C6.4087 2 4.88258 2.63214 3.75736 3.75736C2.63214 4.88258 2 6.4087 2 8C2 9.5913 2.63214 11.1174 3.75736 12.2426C4.88258 13.3679 6.4087 14 8 14Z" stroke="#dbab0a" stroke-width="2"/>
    <path d="M8 11C8.79565 11 9.5587 10.6839 10.1213 10.1213C10.6839 9.55871 11 8.79565 11 8C11 7.20435 10.6839 6.44129 10.1213 5.87868C9.5587 5.31607 8.79565 5 8 5C7.20435 5 6.44129 5.31607 5.87868 5.87868C5.31607 6.44129 5 7.20435 5 8C5 8.79565 5.31607 9.55871 5.87868 10.1213C6.44129 10.6839 7.20435 11 8 11Z" fill="#dbab0a"/>
    <path fill-rule="evenodd" clip-rule="evenodd" d="M8 15C9.8565 15 11.637 14.2625 12.9497 12.9497C14.2625 11.637 15 9.85652 15 8H13C13 9.32608 12.4732 10.5979 11.5355 11.5355C10.5979 12.4732 9.3261 13 8 13V15Z" fill="#dbab0a"/>
  </svg>
</div>

<br><br>

Optimised 14px

<div style="height:16px; width:16px;" class="mx-auto">
  <svg fill="none" width="16" height="16" class="anim-rotate" xmlns="http://www.w3.org/2000/svg">
    <path opacity=".5" d="M8 14A6 6 0 1 0 8 2a6 6 0 0 0 0 12Z" stroke="#DBAB0A" stroke-width="2"/>
    <path d="M8 11a3 3 0 1 0 0-6 3 3 0 0 0 0 6Z" fill="#DBAB0A"/>
    <path fill-rule="evenodd" clip-rule="evenodd" d="M8 15a7 7 0 0 0 7-7h-2a5 5 0 0 1-5 5v2Z" fill="#DBAB0A"/>
  </svg>
</div>

<br><br>

Just a <&zwnj;circle&zwnj;>

<div style="height:16px; width:16px;" class="mx-auto">
  <svg class="anim-rotate" width="16px" height="16px" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
    <circle cx="50" cy="50" r="50" fill="#DBAB0A"/>
  </svg>
</div>
  
<br><br>

Just a <&zwnj;circle&zwnj;> but its parent rotates instead (doesn’t help)

<div class="anim-rotate" style="height:16px; width:16px;" class="mx-auto">
  <svg width="16px" height="16px" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
    <circle cx="50" cy="50" r="50" fill="#DBAB0A"/>
  </svg>
</div>

<br><br>
  
Redrawn 14px but two SVGs and the complete circles are static

<!-- Black canvas -->
<div style="height:16px; width:16px; position: relative;" class="mx-auto">
  <!-- SVG for full circles -->
  <svg fill="none" width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" title="in_progress_icon" aria-hidden="true" style="position: absolute;">
    <!-- Middle circle -->
    <path d="M8 11C8.79565 11 9.5587 10.6839 10.1213 10.1213C10.6839 9.55871 11 8.79565 11 8C11 7.20435 10.6839 6.44129 10.1213 5.87868C9.5587 5.31607 8.79565 5 8 5C7.20435 5 6.44129 5.31607 5.87868 5.87868C5.31607 6.44129 5 7.20435 5 8C5 8.79565 5.31607 9.55871 5.87868 10.1213C6.44129 10.6839 7.20435 11 8 11Z" fill="#dbab0a"/>
    <!-- Outer circle -->
    <path opacity="0.5" d="M8 14C9.5913 14 11.1174 13.3679 12.2426 12.2426C13.3679 11.1174 14 9.5913 14 8C14 6.4087 13.3679 4.88258 12.2426 3.75736C11.1174 2.63214 9.5913 2 8 2C6.4087 2 4.88258 2.63214 3.75736 3.75736C2.63214 4.88258 2 6.4087 2 8C2 9.5913 2.63214 11.1174 3.75736 12.2426C4.88258 13.3679 6.4087 14 8 14Z" stroke="#dbab0a" stroke-width="2"/>
  </svg>
  <!-- SVG for semicircle -->
  <svg fill="none" width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" style="position: absolute;" class="anim-rotate">
    <path fill-rule="evenodd" clip-rule="evenodd" d="M8 15C9.8565 15 11.637 14.2625 12.9497 12.9497C14.2625 11.637 15 9.85652 15 8H13C13 9.32608 12.4732 10.5979 11.5355 11.5355C10.5979 12.4732 9.3261 13 8 13V15Z" fill="#dbab0a"/>
  </svg>
</div>
!

CSS 

              
                // Primer CSS animation utility class
.anim-rotate {
  animation: rotate-keyframes 1s linear infinite;
}

@keyframes rotate-keyframes {
  100% {
    transform: rotate(360deg);
  }
}

// Demo style
body {
  margin: 5%;
}

// Demo style; hooks into existing centering class from prod
.mx-auto {
  background-color: black;
}



// Styles for pure CSS icon

// Container
.spinner {
  --spinner-container-size: 1em;
  --spinner-icon-size: calc(var(--spinner-container-size) - 0.125em);
  --spinner-icon-inset: calc((var(--spinner-container-size) - var(--spinner-icon-size)) / 2);
  --spinner-center-size: 0.375em;
  --spinner-center-inset: 0.125em;
  --spinner-border-width: 0.125em;
  --spinner-color: #DBAB0A;
  --spinner-opacity: 0.5;
  
  font-size: 16px;
  height: var(--spinner-container-size);
  width: var(--spinner-container-size);
  position: relative;
}

// Border fragment
.spinner::after {
  border-color: transparent;
  border-radius: 50%;
  border: var(--spinner-border-width) solid transparent;
  // Give only 1/4 of the border a color to draw the fragment
  border-top-color: var(--spinner-color);
  box-sizing: border-box;
  content: "";
  height: var(--spinner-icon-size);
  inset: var(--spinner-icon-inset);
  position: absolute;
  width: var(--spinner-icon-size);
}

// Full border
.spinner-inner {
  border-radius: 50%;
  border: var(--spinner-border-width) solid var(--spinner-color);
  box-sizing: border-box;
  height: var(--spinner-icon-size);
  inset: var(--spinner-icon-inset);
  opacity: var(--spinner-opacity);
  position: absolute;
  width: var(--spinner-icon-size);
}

// Solid inner circle
.spinner-inner::after {
  background-color: var(--spinner-color);
  border-radius: 50%;
  content: "";
  height: var(--spinner-center-size);
  inset: var(--spinner-center-inset);
  position: absolute;
  width: var(--spinner-center-size);
}
!

JS
!
999px

Console