html .main-navigation a:before, html .main-navigation a:after,
html .main-navigation .current>a:before, html .main-navigation .current>a:after {
    bottom: 0;
    top: inherit;
    margin-right: 0;
    margin-left: 0;
}

html .main-navigation .current>a:after {
    width: 100%;
}

html .main-navigation a:before {
    margin-left: 0;
}

html .main-navigation a:after {
    margin-left: 0;
}

html .main-navigation a:hover:before {
    width: 100%;
    margin-left: 0;
}

html .main-navigation a:hover:after {
    margin-right: 0;
    width: 100%;
}

html .main-navigation li > a {
    padding-bottom: 3px;
}

https://themeforest.net/item/dazzle-portfolio-theme-for-creative-professionals/18360685?ref=deliciousthemes

Changing the Dazzle`s strikethrough line menu style to underline.

Dazzle menu strikethrough line to underline

wordpress

CSS