.nav-tabs .nav-item.show .nav-link, .nav-tabs .nav-link.active {
    color: blue;
    background-color: #e6e6e6;
    border-bottom: 2px solid blue;
}

.nav-tabs li:after {
    content: '';
    display: block;
    margin: auto;
    height: 2px;
    width: 0px;
    background: transparent;
    transition: width .5s ease, background-color .5s ease;
}
.nav-tabs li:hover:after {
    width: 100%;
    background: blue;
}

p{

}


