.mnu1 {
    list-style: none;
    margin: 0;
    padding: 0;
    text-align: center;
}

    .mnu1 li {
        display: inline;
    }

    .mnu1 a {
        display: inline-block;
        padding: 10px;
        color: rgba(18, 16, 16, 0.90)
    }

.current {
    color: red;
    border: 1px solid red;
}