#toTop {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: #152d5b;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
  
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s ease, visibility .3s ease, transform .2s ease;
    z-index: 1000;
  }
  #toTop svg { fill: #fff; }
  #toTop.show { opacity: .5; visibility: visible; }
  #toTop.show:hover { opacity: 1; transform: translateY(-2px); }