.back-to-top {
    position: fixed;
    bottom: 90px;
    right: 5px;
    display: none;
    background-color: #444;
    color: white;
    font-size: 1.5em; /* menší než předchozí */
    width: 40px;
    height: 40px;
    border-radius: 50%;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
    transition: background-color 0.3s ease, transform 0.4s ease, opacity 0.3s ease;
    z-index: 1000;
    opacity: 0;
    transform: translateY(20px);
  }
  
  /* Show the button when scrolling down */
  .back-to-top.show {
    display: block;
    opacity: 1;
    transform: translateY(0);
  }
  
  /* Hover efekt */
  .back-to-top:hover {
    background-color: #666;
  }
  
  /* Kliknutí = změna barvy na crimson */
  .back-to-top.clicked {
    background-color: #B45309;
  }