img.login{
    filter: grayscale(20%) sepia(65%) contrast(150%);
    -webkit-filter: grayscale(20%) sepia(65%) contrast(150%);
    -moz-filter: grayscale(20%) sepia(65%) contrast(150%);
}

a.nav-link.active {
    text-decoration: underline;
    text-decoration-thickness: 5px;
    text-decoration-color: #000000;
    font-weight: bold;
}