[README.md] change SS img width

Author: chrissimpkins

README.md

@@ -15,9 +15,7 @@
 
 `fdiff` is a Python command line comparison tool for differences in the OpenType table data between font files.  The tool provides cross-platform support on macOS, Windows, and Linux systems with a Python v3.6+ interpreter.
 
-<div style="width:95%;background-color:#26282f;text-align:center">
-<img src="https://raw.githubusercontent.com/source-foundry/fdiff/img/img/diff-example-crunch.png" width="400"/>
-</div>
+<img src="https://raw.githubusercontent.com/source-foundry/fdiff/img/img/diff-example-crunch.png" width="600"/>
 
 ## What it does