body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    overflow: hidden;
  }
  
  .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: linear-gradient(45deg, #3498db, #2ecc71);
    animation: gradientAnimation 10s infinite alternate-reverse;
  }
  
  @keyframes gradientAnimation {
    0% {
      background-position: 0% 0%;
    }
    100% {
      background-position: 100% 100%;
    }
  }
  
  .input-file {
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: rgba(255, 255, 255, 0.7);
  }
  
  .buttons-container {
    display: flex;
    gap: 10px;
  }
  
  .btn {
    padding: 10px;
    background-color: #4caf50;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  .btn:hover {
    background-color: #45a049;
  }
  
  .canvas {
    margin-top: 20px;
    border: 1px solid #000;
  }