Fix Imge Size

Hi,
i’m using a respinsive theme (skeleton by simple themes) and your imgae widget to portrait the site-logo. with low resolution, or when downsizing the browserwindow the sidebar is getting thinner (while the menue breaks into two lanes) which i consider to be a responive themefunction (?) unfortunately the logo in the image widget easily gets an eggshape that way – which is my main problem here. is there a way i can fix the size of the image inside the image widget (so that the image will always have the wanted size – no matter what) or would this rather be something to adress into the theme support?

any help is highly appreciated! thanks in advance!

https://ww.wp.xz.cn/plugins/image-widget/