My #menu modification of https://github.com/celeron55/minetest.net_dokutemplate2/blob/master/css/h6e-custom.css. I hope it will work. I removed all !important's which were needed locally in stylish to override sites default and hope they are not needed in the original. Transparent background of minetest-icon-40.png is appreciated to not break li…

gistfile1.css

#menu {
        padding:0;
        margin:0;
        padding-bottom: 1em;
        text-align: center;
}

#menu ul {
        padding:0;
        margin:0;
        list-style-type:none;
        border-bottom: 1px solid #000;
}

#menu ul a {
        text-decoration: none;
}

#menu ul a:hover {
        text-decoration: underline;
}

#menu a.sub:link,
#menu ul ul li a:link {
        display:block;
        min-width:140px;
        height:22px;
        text-align:left;
        line-height:22px;
        color:#404040;
        margin:0;
}

#menu ul li a:hover,
#menu a.sub:hover,
#menu ul ul li a:hover {
        color: #009dff;
}

#menu ul ul {
        position:absolute;
        width:auto;
        z-index:122;
        display:none;
        padding:0;
        margin:0;
        text-align: left;
        border: 1px solid #000;
        border-top: none;
}

#menu ul ul li {
        white-space: nowrap;
        width: 100%;
}

#menu li {
        position:relative;
        display:inline-block;
        width:auto;
        padding:0;
        margin:0;
        margin-right:10px;
}

#menu ul li:hover ul {
        display:block;
        background:#fff;
}

#menu ul li:hover {
        background-color:#fff;
}

#menu a:link,
#menu a:visited {
        display:inline;
        width:auto;
        color:#323232;
        background:none;
        padding-left:5px;
        padding-right:5px;
        font-weight:regular;
        font-family:"Calibri", sans-serif;
}


#menu a:hover,
#menu a:visited:hover {
        color: #009dff;
}

#menu a.sub_ex:before {
        content: "→ ";
}

#menu a.sub_ex:link {
        display:block;
        min-width:140px;
        height:22px;
        text-align:left;
        line-height:22px;
        color:#404040;
        margin:0;
}

#menu a.sub_ex:hover {
        color: #009dff;
}

.h6e-main-content {
        border: 1px solid #000;
        border-width: 0 1px 0 1px;
}