Update README.md

Author: rafaelfsilva

README.md

@@ -12,7 +12,7 @@ Collection and curation of open access production workflow executions from vario
 
 A [WfFormat WfInstances browser web application](https://wfinstances.ics.hawaii.edu) is available to easily browse, filter, and visualize the instances available in this repository.
 
-<a href="https://wfinstances.ics.hawaii.edu" target="_blank"><img src="./wfinstances-browser-screenshot.jpeg" width=350 /></a>
+<a href="https://wfinstances.ics.hawaii.edu" target="_blank"><img src="./wfinstances-browser-screenshot.jpeg" width=600 style="border-radius: 1em" /></a>
 
 ![Downloads](https://img.shields.io/badge/downloads-264-blue.svg)
 ![Visualizations](https://img.shields.io/badge/visualizations-804-orange.svg)