body {
      font-family: sans-serif;
      text-align: center;
      background: #fff;
      padding: 15px 40px;
    }

    h1 {
      margin-bottom: 20px;
    }

    .row {
      display: flex;
      justify-content: center;
      align-items: flex-end;
      gap: 20px;
      margin-top: 20px;
    }

    .circle-container {
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .circle {
      width: 100px;
      height: 100px;
      border-radius: 50%;
      background-color: #eee;
      border: 2px solid #444;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .circle.selected {
      transform: scale(1.2);
      border: 4px solid #000;
    }

    .label {
      margin-top: 10px;
      font-weight: bold;
      font-size: 20px;
    }

    .symbol {
      font-size: 40px;
      font-weight: bold;
      user-select: none;
      align-self: flex-end;
    }

    .palette {
      display: none;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin: 30px 0 20px;
    }

    .color-btn {
      width: 30px;
      height: 30px;
      border-radius: 50%;
      border: 2px solid #555;
      cursor: pointer;
    }

    .reset-btn {
      margin-top: 10px;
      padding: 10px 20px;
      font-size: 16px;
      font-weight: bold;
      background-color: #f44336;
      color: white;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      transition: background-color 0.3s;
    }

    .reset-btn:hover {
      background-color: #d32f2f;
    }

    .history-container {
      margin-top: 40px;
    }

    .history-title {
      font-weight: bold;
      font-size: 21px;
      margin-bottom: 9px;
    }

    .history-item {
      display: flex;
      justify-content: center;
      align-items: flex-end;
      gap: 20px;
      margin-top: 10px;
    }

    .history-item .circle {
      width: 60px;
      height: 60px;
      cursor: default;
    }

    .history-item .symbol {
      font-size: 30px;
    }