Follow along with the video below to see how to install our site as a web app on your home screen.
Note: this_feature_currently_requires_accessing_site_using_safari
Yup @Juicy J, it's easy to do with Gimp 2.8 (free piece of software since GNU license) and its 'IWarp' command:
--> you select all side areas you want to stretch --> then go on "Filters" --> then on Warp --> then on IWarp --> then you can enlarge the selected areas like you want
Hope you will also find fitting tutorials among the following gimp tutorials on yt:
gimp images warp - YouTube