Border-left invisible on Chrome when navigator fullscreen

[borisBelloc]

Hello, i'm using a simple canva.

My only css on the canva's parent is :
#canvaContainer { height: 100px; max-width: 240px; }

Everything works ok on firefox but when chrome is in full screen the left border disappears.
Any idea how to fix it?

If I add a 1px border with css, the border is too big on working side because it make a double border (left and top in this picture):

Edit : I changed size of canvas and now its the border right and bottom that disappeared in full screen (chrome); still ok on Firefox