body {
    padding-top: 70px; 
}

.navbar .nav-link {
    position: relative;
    padding-bottom: 6px;
}

.navbar .nav-link.active {
    font-weight: 600;
}

.navbar .nav-link.active::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 3px;             
    background-color: #fff;  
    border-radius: 2px;
}
.navbar .nav-link::after {
    transition: width 0.3s ease;
}

#backToTop {
    position: fixed;
    bottom: 40px;
    right: 40px;
    display: none; 
    z-index: 1000;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    padding: 0;
}
#backToTop i {
    font-size: 20px;
}