Common WordPress Third-Tier Dropdown Menu Issue

@media only screen and (min-width: 768px) {
.nav li .sub-menu li:hover .sub-menu {
display: block;
position: absolute;
left: 181px;
top: 0;
background: #fff;
border: 1px solid white;
border-top: 5px solid #686868;
}
.nav li:hover .sub-menu .sub-menu {
display: none;
}
li:hover .sub-menu {
display: block;
position: absolute;
left: 0;
top: 32px;
background: #fff;
border-left: 5px solid #807b91;
padding-left: 10px;
text-align: left;
}
li:hover .sub-menu a {
color: #201f63;
margin: 0;
font-size: 1em;
}
li:hover .sub-menu a:hover {
border-bottom: none;color: #847f95;
}
.menu li {
position: relative;
margin: 10px 0;
display: inline-block;
}
#navigation-container .row {
overflow: visible;
}
div#header-menu {
float:none;
}
ul#menu-main-navigation {
margin: 0;
}
}