.scroll-to-top-btn {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    background-color: transparent;
    color: #000;
    border: none;
    outline: none;
    cursor: pointer;
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1000;
  }
  
  .scroll-to-top-btn.active {
    opacity: 1;
  }
  
  .scroll-to-top-btn .progress-bar {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin-top: -20px;
    margin-left: -20px;
    background-color: transparent;
    border-radius: 50%;
    transform: rotate(-90deg);
    transform-origin: center;
    transition: background-color 0.3s ease;
    
  }
  
  .scroll-to-top-btn.active .progress-bar {
    background-color: #a10808;
  }
  
  .scroll-to-top-btn .progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 15px;
    height: 15px;
    background-color: #a10808;
    border-radius: 50%;
    transform: translateX(-50%);
    transition: opacity 0.3s ease;
    opacity: 0;
  }
  
  .scroll-to-top-btn.active .progress-bar::after {
    opacity: 1;
  }
  
  .scroll-to-top-btn .arrow {
    display: block;
    position: relative;
    font-size: 24px;
    line-height: 1;
    transition: opacity 0.3s ease;
    opacity: 0;
  }
  
  .scroll-to-top-btn.active .arrow {
    opacity: 1;
  }