Making CSS Drop Down Menu 2 Columns - css

Question

Long time lurker but posting for the first time. I've been searching around already and found a solution to what I'm looking to do but for some reason I'm getting a weird result.
Basically my menu has so many items that I would like to see them in 2 columns. By searching I found that I needed to make the "ul" twice as wide as the "li" and float the "li" left. It is working but now I'm getting a blank space in the 2nd row.
#cssmenu {
padding: 0;
margin: 0;
border: 0;
width: auto;
}
#cssmenu ul,
#cssmenu li {
list-style: none;
margin: 0;
padding: 0;
}
#cssmenu ul {
z-index: 597;
}
#cssmenu ul li {
float: left;
min-height: 1px;
vertical-align: middle;
}
#cssmenu ul li.hover,
#cssmenu ul li:hover {
position: relative;
z-index: 599;
cursor: default;
}
#cssmenu ul ul {
visibility: hidden;
position: absolute;
top: 100%;
left: 0;
z-index: 598;
width: 100%;
}
#cssmenu ul ul li {
float: left;
width: 250px;
}
#cssmenu ul ul ul {
top: 0;
left: 250px;
width: 500px;
height: 20px;
}
#cssmenu ul li:hover > ul {
visibility: visible;
}
#cssmenu ul ul {
bottom: 0;
left: 0;
}
#cssmenu ul ul {
margin-top: 0;
}
#cssmenu ul ul li {
font-weight: normal;
}
#cssmenu a {
display: block;
line-height: 1em;
text-decoration: none;
}
/* Custom CSS Styles */
#cssmenu {
background: #333333;
border-bottom: 4px solid #1b9bff;
font-family: 'Oxygen Mono', Tahoma, Arial, sans-serif;
font-size: 12px;
}
#cssmenu > ul {
*display: inline-block;
}
#cssmenu:after,
#cssmenu ul:after {
content: '';
display: block;
clear: both;
}
#cssmenu ul {
text-transform: uppercase;
}
#cssmenu ul ul {
border-top: 4px solid #1b9bff;
text-transform: none;
min-width: 190px;
}
#cssmenu ul ul a {
background: #1b9bff;
color: #ffffff;
border: 1px solid #0082e7;
border-top: 0 none;
line-height: 100%;
padding: 8px 20px;
font-size: 12px;
}
#cssmenu ul ul ul {
border-top: 0 none;
}
#cssmenu ul ul li {
position: relative;
}
#cssmenu ul ul li:first-child > a {
border-top: 1px solid #0082e7;
}
#cssmenu ul ul li:hover > a {
background: #4eb1ff;
color: #ffffff;
}
#cssmenu ul ul li:last-child > a {
-moz-border-radius: 0 0 3px 3px;
-webkit-border-radius: 0 0 3px 3px;
border-radius: 0 0 3px 3px;
-moz-background-clip: padding;
-webkit-background-clip: padding-box;
background-clip: padding-box;
-moz-box-shadow: 0 1px 0 #1b9bff;
-webkit-box-shadow: 0 1px 0 #1b9bff;
box-shadow: 0 1px 0 #1b9bff;
}
#cssmenu ul ul li:last-child:hover > a {
-moz-border-radius: 0 0 0 3px;
-webkit-border-radius: 0 0 0 3px;
border-radius: 0 0 0 3px;
-moz-background-clip: padding;
-webkit-background-clip: padding-box;
background-clip: padding-box;
}
#cssmenu ul ul li.has-sub > a:after {
content: '+';
position: absolute;
top: 50%;
right: 15px;
margin-top: -8px;
}
#cssmenu ul li:hover > a,
#cssmenu ul li.active > a {
background: #1b9bff;
color: #ffffff;
}
#cssmenu ul li.has-sub > a:after {
content: '+';
margin-left: 5px;
}
#cssmenu ul li.last ul {
left: auto;
right: 0;
}
#cssmenu ul li.last ul ul {
left: auto;
right: 99.5%;
}
#cssmenu a {
background: #333333;
color: #CBCBCB;
padding: 0 20px;
}
#cssmenu > ul > li > a {
line-height: 48px;
font-size: 12px;
}
#cssmenu img {
vertical-align: middle;
}
Here's my jsFiddle: https://jsfiddle.net/b1hsakq2/1/
I'm missing something in the CSS....
Thanks for the help

Answer 1

The border-top on your first-child in list is causing the 3rd list item to not fit. See the revised fiddle here where I commented it out:
https://jsfiddle.net/b1hsakq2/3/
#cssmenu ul ul li:first-child > a {
/*border-top: 1px solid #0082e7;*/
}
The other option is to keep the above border-top on the first-child, but to even the height within the list, add a border-top to the other list items by adding this:
#cssmenu ul ul li > a {
border-top: 1px solid #0082e7;
}