/* arrow.css */
#back-to-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: #00b345;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  #back-to-top-btn:hover {
    background-color: #008a36;
  }
  
  #back-to-top-btn.visible {
    opacity: 1;
    visibility: visible;
  }