how to make drop down header options in 3 rows instead of 1 long list

[jakeeddy]

hey guys, i was wondering if it is possible to have my collections that drop down from the navigation menu span across 3 columns instead of having them all in 1 long list

https://mugcellent.co.uk/

pass is beta

[paramSoft]

Please place this code  at the end of theme.scss

#MenuParent-2 {
    -webkit-column-count: 3;
    -moz-column-count: 3;
    column-count: 3;
}