HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>opacity: 0</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .stage {
      background: #e2e8f0;
      padding: 16px;
    }

    .hidden {
      opacity: 0;
      background: #2563eb;
      color: #fff;
      padding: 16px;
      font-weight: 700;
    }

    .after {
      margin-top: 8px;
      font-weight: 700;
    }
  </style>
</head>
<body>
  <p>The blue box has <strong>opacity: 0</strong>. It is invisible, but the space below still starts after its height.</p>
  <div class="stage">
    <div class="hidden">You cannot see this box</div>
    <div class="after">I still sit below the invisible box</div>
  </div>
</body>
</html>

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CSS opacity Property — Fully Transparent