Active state on one page navigation CSS

#split_menu a.active {
    color: #41e4ff;
    border-bottom: 3px solid #41e4ff;
    padding-bottom: 0px;
    transition: border-color 0.4s ease;
}

#split_menu a {

    border-bottom: 3px solid transparent;
    padding-bottom: 0px;

}

ion-icon {
    visibility: hidden;
    margin-bottom: 2px;
    margin-right: 8px;
    color: hsl(206deg 100% 73%);
    font-size: 20px;
}