.nav-item{
    position: relative;
}
.nav-item:after {
    content: '';
    position: absolute;
    display: none;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: currentColor;
    border-top: 1.5px solid currentColor;
    border-radius: 1.5px;
    border-bottom: 1.5px solid currentColor;
}
.nav-item:hover:after{
    display: block;
}
