body {
    margin: 0;
    padding: 0;
    height: 100vh; /* Hauteur de la fenêtre */
    overflow-y: auto; /* Permet le défilement vertical */
  }
  
  .background-container {
    position: fixed; /* Fixe le fond d'écran */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1; /* Place le fond derrière le contenu */
    display: flex;
    opacity: 0.5; /* Transparence pour le fond */
  }
  
  .header-container {
    background: linear-gradient(to right, #4caf50, #2196f3); /* Gradient background */
    color: white; /* White text */
    text-align: center; /* Center the text */
    padding: 10px; /* Add padding around the header */
    border-radius: 10px; /* Rounded corners */
    margin-bottom: 20px; /* Add spacing below the header */
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); /* Subtle shadow for depth */
  }
  
  .header-title {
    font-size: 2.5rem; /* Large font size for the title */
    font-weight: bold; /* Bold text */
    margin: 0; /* Remove default margin */
  }
  
  .header-subtitle {
    font-size: 1.2rem; /* Smaller font size for the subtitle */
    font-weight: 300; /* Light text */
    margin: 10px 0 0; /* Add spacing above the subtitle */
  }