body {
    font-family: Arial, sans-serif;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
    background-color: beige;
}
h1 {
    margin-bottom: 20px;
}
.file-upload {
    display: inline-block;
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border-radius: 5px;
    cursor: pointer;
    margin-bottom: 20px;
}
.file-upload input[type="file"] {
    display: none;
}
.row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 20px;
}

canvas {
    max-width: 100%;
    height: auto;
}
.image-matrix {
    visibility: hidden;
}
.image-matrix .canvas-container {
    margin: 10px;
}



.loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
  }
  
  .spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
  }
  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }
  
  .hidden {
    display: none;
  }