Dyanmic изменяет размер счетчика загрузки CSS3 по пикселям

* {
  box-sizing: border-box;
}

:root { /* init for the var() values */
  --size: 20;/* value used to set the loader's width and adjust border's width */
  --width: calc(var(--size) * 1%);
  --widthBorder: calc( clamp(20px, 6vw, 80px) * var(--size) * 0.005);
}

.a,/* for the demo , just a bunch of containers */
.b,
.c,
.d,
.d,
.e {
  position: relative;
  /* what the parent loader needs to be (absolute/fixed/sticky works too, static not) */
  float: left;
  border: solid;
  margin: 1em;
}

div.a {
  --size: 50; /* reset the value used to set the loader's width */
  width: 50%;
  padding-top: 50%;
}

.b {
  --size: 10;/* reset the value used to set the loader's width */
  width: 600px;
  height: 200px;
}

.c {
  --size: 15;/* reset the value used to set the loader's width */
  width: 25%;
  padding-top: 20%;
}

.d {
  --size: 30;/* reset the value used to set the loader's width */
  width: 800px;
  height: 400px;
}

.e {
  --size: 14;/* reset the value used to set the loader's width */
  width: 90%;
  min-height: 20vh;
}

div {
  width: 20%;
  padding-top: 20%;
}
/* loader styles */
.loader {
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

.loader b {
  display: grid;
  animation: rotate 3s -1s infinite linear;
  border: solid var(--widthBorder) transparent;
  padding: calc(var(--widthBorder) / 2);
  border-radius: 50%;
  border-right-color: #71c491;
  border-top-color: #f7941d;
  grid-row: 1;
  grid-column: 1;
  margin: 0;
}

.loader>b {
  margin: auto;
  width: var(--width);
}

.loader>b:before {
  content: "";
  padding-top: 100%;
  grid-row: 1;
  grid-column: 1;
}

.loader b b {
  border-right-color: #21409a;
  border-top-color: #92278f;
}

.loader b b b {
  border-right-color: #13b0e6;
  border-top-color: #18244c;
  padding: 0;
}

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

<div class=a>
  <div class = "loader"><b><b><b></b></b>
    </b>
  </div>
</div>
<div class=b>
  <div class = "loader"><b><b><b></b></b>
    </b>
  </div>
</div>
<div class=c>
  <div class = "loader"><b><b><b></b></b>
    </b>
  </div>
</div>
<div class=d>
  <div class = "loader"><b><b><b></b></b>
    </b>
  </div>
</div>
<div class=e>
  <div class = "loader"><b><b><b></b></b>
    </b>
  </div>
</div>