<div class="container">
  <div class="box hsl" style="--hue: 60">あ</div>
  <div class="box hsl" style="--hue: 120">あ</div>
  <div class="box hsl" style="--hue: 180">あ</div>
  <div class="box hsl" style="--hue: 240">あ</div>
  <div class="box hsl" style="--hue: 300">あ</div>
  <div class="box hsl" style="--hue: 360">あ</div>
</div>

<div class="container">
  <div class="box oklch" style="--hue: 60">あ</div>
  <div class="box oklch" style="--hue: 120">あ</div>
  <div class="box oklch" style="--hue: 180">あ</div>
  <div class="box oklch" style="--hue: 240">あ</div>
  <div class="box oklch" style="--hue: 300">あ</div>
  <div class="box oklch" style="--hue: 360">あ</div>
</div>

.container {
  display: flex;
  gap: 10px;
  width: fit-content;
  margin: 10px auto;
}

.box {
  width: 80px;
  height: 80px;
  color: #fff;
  font-size: 40px;
  line-height: 80px;
  text-align: center;
}

.hsl {
  background-color: hsl(var(--hue) 70% 70%);
}

.oklch {
  background-color: oklch(70% 0.15 var(--hue));
}