HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>Vertical sidebar label</title>

  <style>

    body {

      font-family: system-ui, sans-serif;

      padding: 1.5rem;

      color: #334155;

      background: #f8fafc;

    }



    .layout {

      display: flex;

      align-items: stretch;

      max-width: 20rem;

      border: 1px solid #cbd5e1;

      border-radius: 0.5rem;

      overflow: hidden;

      background: #fff;

    }



    .sidebar-label {

      writing-mode: vertical-rl;

      padding: 0.75rem 0.5rem;

      background: #1e293b;

      color: #f8fafc;

      font-size: 0.8125rem;

      font-weight: 600;

      letter-spacing: 0.06em;

      text-transform: uppercase;

    }



    .content {

      flex: 1;

      padding: 1rem;

      font-size: 0.875rem;

      line-height: 1.55;

    }

  </style>

</head>

<body>

  <h1>Vertical label</h1>

  <div class="layout">

    <div class="sidebar-label">Revenue Q4</div>

    <div class="content">

      Chart or panel content goes here. The label stays compact on the side.

    </div>

  </div>

</body>

</html>

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CSS writing-mode Property - Sidebar Label