<input type="range" min="0" max="100" step="1" value="20">

<input type="range" min="0" max="100" step="1" style="--c: lightblue;--l: 6px;--g:12px;">

<input type="range" min="0" max="100" step="1" value="70" style="--c: red;--l: 4px;">

input {
  --c: orange; /* active color */
  --g: 8px; /* the gap */
  --l: 5px; /* line thickness*/
  --s: 30px; /* thumb size*/
  
  width: 400px;
  height: var(--s); /* needed for Firefox*/
  -webkit-appearance :none;
  -moz-appearance :none;
  appearance :none;
  background: none;
  cursor: pointer;
  outline: 2px dashed #000;
}

/* chromium */
input[type="range" i]::-webkit-slider-thumb{
  height: var(--s);
  aspect-ratio: 1;
  border-radius: 50%;
  box-shadow: 0 0 0 var(--l) inset var(--c);
  border-image-source: linear-gradient(90deg,var(--c) 50%,#ababab 0); 
  border-image-slice: 1;
  border-image-width: 0 200px;
  border-image-outset: 0 calc(200px + var(--g));
  -webkit-appearance: none;
  appearance: none;
}
/* Firefox */
input[type="range"]::-moz-range-thumb {
  height: var(--s);
  width: var(--s);
  background: none;
  border-radius: 50%;
  box-shadow: 0 0 0 var(--l) inset var(--c);
  -moz-appearance: none;
  appearance: none;
}


/**/
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  gap: 40px;
  place-content: center;
  background: repeating-linear-gradient(-45deg, #fff 0 20px, #f9f9f9 0 40px)
}