limesurvey_ynh/sources/application/extensions/Menu/assets/nav.css

nav {
    overflow: hidden;
    border-color: #EFEFEF;
    border-style: solid;
    border-width: 1px;
    padding: 2px;
}

nav ol {
    background-color: white;
    list-style: none;
    padding: 0px;
    margin: 0px;
    display: inline-block;
    box-shadow: 7px 7px 5px rgba(50, 50, 50, 0.75);
}

nav > ol.menubar-left {
    float: left;
}

nav > ol.menubar-right {
    float: right;
}


nav li {
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    white-space:nowrap;
    padding: 5px;
}

nav ol.level0 > li {
    padding: 2px !important;
}


nav a {
    display: inline-block;
    
    width: 100%;
}

nav img {
    float: none !important;
    vertical-align: middle;
}

nav ol.level0 {
    box-shadow: none !important;
}
nav ol.level0 > li {
    display: inline-block;
}

nav ol.level1 {
    z-index: 1;
    position: absolute;
    display: block;
    visibility: hidden;
}


nav ol.level1 > li {
    position: relative;
}

nav ol.level1 img {
    margin-right: 10px;
}

nav ol.level2 {
    top: 0px;
    visibility: hidden;
    position: absolute;
    left: 100%;
}

nav li:hover > ol {
    visibility: visible;
}

nav li:hover{
    background-color: #e0dfde;
}

nav select, nav label {
    margin: 0px;
    display: inline-block;
}

nav .select {
	width: 300px;
}
/* Fix bootstrap causing menu to disappear on FF */
nav.menubar { clear: both; }