Small dirt in menu application

[leandroungari]

I don't whether this happen only with me. I am using Ubuntu 18.04 OS (Default), which desktop environment is Gnome.
The DevDocs application works well, although the application has small defects in menu items, some points in font or some anti-aliasing problem or something else. I took a print screen of the problem.

It also may be a Electron problem.