#custom-back-to-top {
    position: fixed;
    bottom: 60px;
    left: 40px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: #0180B6;
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    text-decoration: none;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 9999;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    cursor: pointer;
}
    #custom-back-to-top:hover {
        background: #2b3280; /* Цвет при наведении */
        transform: scale(1.05);
    }
    #custom-back-to-top.visible {
        opacity: 1;
        visibility: visible;
    }