Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/2401
## 6. font-size, text-shadow for menus in the navbar including collapsed
version.
### 6-1 normal version
Since the toplevel menu's font-size is `15px`, sub menus should have the
equal or less font-size. currently, it's `16px`.
- Let's set font-size `15px` for `.docs .dropdown-menu li span`
#### Current

#### Fixed

### 6-2 collapsed version
- `text-shadow` in the sub menus can be decreased. too much IMO: from `1px
2px #353131` to `1px 1px #353131`
- for `font-size`, we can apply the same policy with **6-1**
* `15px` for `.navbar-inverse .navbar-nav > li > a ` (in all media
queries for the collapsed version just not for `@media only screen and
(max-width: 996px) and (min-width: 768px)`
* `15px` for `.docs .dropdown-menu b` (in all media queries for the
collapsed version )
* `14px` for `.navbar-nav .open .dropdown-menu` (for all for the
collapsed version)
* fix padding-bottom for `.docs .dropdown-menu li span` from `12px 10px
12px 20px` to `12px 10px 12px 15px`. Currently it's too close to children.
#### Current

#### After

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