#circle {
    background-size: cover;
    border-radius: 40% 40% 40% 40%;
    width: 40px;
    height: 40px;
}

.nav-link {
    font-weight: 500;
}

.nav-link:hover,
.navbar-brand:hover {
    background-color: lightgrey;
    opacity: 0.8;
}