HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>flex: 1 1 100px</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

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

    .row {
      display: flex;
      gap: 8px;
    }

    .row span {
      padding: 10px;
      border: 1px solid #93c5fd;
      background: #eff6ff;
      text-align: center;
    }

    .a {
      flex: 1 1 100px;
    }

    .b {
      flex: 1;
    }
  </style>
</head>
<body>
  <p>Three values: <strong>grow</strong>, <strong>shrink</strong>, then <strong>basis</strong>.</p>
  <div class="row">
    <span class="a">1 1 100px</span>
    <span class="b">1</span>
  </div>
</body>
</html>

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CSS flex Property — three values