console 命令行工具 X clear

console

<div style="--index: 1">Hello World</div>
<div style="--index: 2">Hello World</div>
<div style="--index: 3">Hello World</div>
<div style="--index: 4">Hello World</div>

<div class="round"></div>

div {
   background-color: hsl(
    calc(mod(var(--index), 3) * 120), 
    80%,
    70%
  );
}

.round {
    width: round(100vw / 2, 50px);
    height: 100px;
    border: 1px solid red;
}