GeneratePress Divider between Menu Items

@media (min-width: 769px) {
    .main-navigation .main-nav > ul > li:not(:last-child) {
        position: relative;
    }

    .main-navigation .main-nav > ul > li:not(:first-child) > a:after {
        content: " \007C";
        display: block;
        position: absolute;
        left: 0;
        top: 0;
        font-size: 10px;
    }
}