<h1>Simple CSS Bar Chart</h1>
<div class="simple-bar-chart">
  
  <div class="item" style="--clr: #5EB344; --val: 80">
    <div class="label">Label 1</div>
    <div class="value">80%</div>
  </div>
  
  <div class="item" style="--clr: #FCB72A; --val: 50">
    <div class="label">Label 2</div>
    <div class="value">50%</div>
  </div>
  
  <div class="item" style="--clr: #F8821A; --val: 100">
    <div class="label">Label 3</div>
    <div class="value">100%</div>
  </div>
  
  <div class="item" style="--clr: #E0393E; --val: 15">
    <div class="label">Label 4</div>
    <div class="value">15%</div>
  </div>
  
  <div class="item" style="--clr: #963D97; --val: 1">
    <div class="label">Label 5</div>
    <div class="value">1%</div>
  </div>
  
  <div class="item" style="--clr: #069CDB; --val: 90">
    <div class="label">Label 6</div>
    <div class="value">90%</div>
  </div>
</div>

.simple-bar-chart{
  --line-count: 10;
  --line-color: currentcolor;
  --line-opacity: 0.25;
  --item-gap: 2%;
  --item-default-color: #060606;
  
  height: 10rem;
  display: grid;
  grid-auto-flow: column;
  gap: var(--item-gap);
  align-items: end;
  padding-inline: var(--item-gap);
  --padding-block: 1.5rem; /*space for labels*/
  padding-block: var(--padding-block);
  position: relative;
  isolation: isolate;
}

.simple-bar-chart::after{
  content: "";
  position: absolute;
  inset: var(--padding-block) 0;
  z-index: -1;
  --line-width: 1px;
  --line-spacing: calc(100% / var(--line-count));
  background-image: repeating-linear-gradient(to top, transparent 0 calc(var(--line-spacing) - var(--line-width)), var(--line-color) 0 var(--line-spacing));
  box-shadow: 0 var(--line-width) 0 var(--line-color);
  opacity: var(--line-opacity);
}
.simple-bar-chart > .item{
  height: calc(1% * var(--val));
  background-color: var(--clr, var(--item-default-color));
  position: relative;
  animation: item-height 1s ease forwards
}
@keyframes item-height { from { height: 0 } }

.simple-bar-chart > .item > * { position: absolute; text-align: center }
.simple-bar-chart > .item > .label { inset: 100% 0 auto 0 }
.simple-bar-chart > .item > .value { inset: auto 0 100% 0 }















/* demo */
body { 
  margin: 0; 
  padding: 2rem; 
  color: #1D1E22;
  background-color: #f0f0f0;
  font-family: system-ui, sans-serif; 
  text-align: center;
}

@media (prefers-color-scheme: dark) {
  body {
    background-color: #1D1E22;
    color: #f0f0f0;
  }
}

body > * { max-width: 45rem; margin-inline: auto}