CSS Log Function Basic

<!DOCTYPE html>
<title>My Example</title>

.log-bar {
    background-color: #6f42c1;
    color: white;
    font-weight: bold;
    height: 40px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    padding-left: 10px;
    border-radius: 4px;
    white-space: nowrap;
    
    /* 
      Calculate the width using a base-10 logarithm: 
      Base Width * log10(var(--val))
    */
    width: calc(var(--base-width) * log(var(--val), 10));
  }
  
  .log-bar:last-child {
    margin-bottom: 0;
  }

/* Assign raw data values to each bar */
  .bar-1 { --val: 10; background-color: #b19cd9; color: #000; }
  .bar-2 { --val: 100; background-color: #9370db; }
  .bar-3 { --val: 1000; background-color: #6f42c1; }
</style>

<div class="log-container">
  <div class="log-bar bar-1">Value: 10</div>
  <div class="log-bar bar-2">Value: 100</div>
  <div class="log-bar bar-3">Value: 1000</div>
</div>