Opening image does not display full content

[kasvith]

Steps to reproduce the issue

1. Open NMM
2. Double click on a file

Expected result

Image must be centered and display full content

Actual result

Some part of image is mizzing

System information (as much as possible)

• Windows 10, XAMPP PHP 7, Chrome Version 66.0.3359.117 (Official Build) (64-bit)

Additional comments

Some CSS issue ofc

[anuragteapot]

@kasvith assign me for this.