* {
      box-sizing: border-box;
    }
    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: #fdfdfd;
      margin: 0;
      padding: 20px;
      color: #333;
    }

    .container {
      display: flex;
      flex-wrap: wrap;
      max-width: 1000px;
      margin: auto;
      background: #fff;
      box-shadow: 0 4px 16px rgba(0,0,0,0.1);
      border-radius: 12px;
      overflow: hidden;
    }

    .left-panel {
      flex: 1;
      min-width: 280px;
      background: url('https://thumbs.dreamstime.com/b/thank-you-text-written-over-green-background-thank-you-spoon-fork-knife-circular-green-123217540.jpg') center center / cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .left-panel::before {
      content: "";
      position: absolute;
      background: rgba(0, 0, 0, 0.4);
      inset: 0;
    }

    .thank-note {
      position: relative;
      color: white;
      padding: 30px;
      text-align: center;
      z-index: 2;
    }

    .thank-note h2 {
      font-size: 2rem;
      margin-bottom: 10px;
    }

    .thank-note p {
      font-size: 1rem;
      line-height: 1.5;
    }

    .right-panel {
      flex: 1;
      min-width: 320px;
      padding: 40px 30px;
    }

    .right-panel h2 {
      color: #d32f2f;
      text-align: center;
      font-size: 2em;
      margin-bottom: 1em;
    }

    form input, form button {
      width: 100%;
      padding: 12px;
      margin: 10px 0;
      border-radius: 8px;
      border: 1px solid #ccc;
      font-size: 1em;
    }

    button {
      background-color: #d32f2f;
      color: #fff;
      font-weight: bold;
      border: none;
      cursor: pointer;
    }

    button:hover {
      background-color: orange;
    }

    @media (max-width: 768px) {
      .container {
        flex-direction: column;
      }
    }