HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS label + input Example</title>
  <style>
    label {
      display: block;
      font-weight: 600;
      color: #1e293b;
    }

    label + input {
      display: block;
      width: 100%;
      max-width: 280px;
      margin-top: 0.35rem;
      margin-bottom: 1rem;
      padding: 0.5rem 0.65rem;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
    }
  </style>
</head>
<body>
  <h1>Sign Up</h1>

  <label for="name">Full name</label>
  <input id="name" type="text" placeholder="Jane Doe">

  <label for="email">Email</label>
  <input id="email" type="email" placeholder="you@example.com">
</body>
</html>

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CSS Adjacent Sibling Selector - Form Label and Input