Problem with the appearance of pictograms + CSS to vary pictogram size

Hello to the Qi Addons team, I hope you’re well.

I have two concerns about a page on which I’d like to integrate your plugin called “Chronological presentation”.

#1 is it possible to give me the line of CSS code to manage the size of the pictograms (.svg)? Please note that I need lines of code that allow me to vary the size of individual pictograms. Because I don’t understand why the first picto is bigger than the second and even bigger than the third… 

+ the icon seems to be enclosed in a circle that prevents it from being displayed completely, is it possible to remove this setting? Or replace it with a square frame, please?

#2 when inserting my .svg from the media library to the plugin, my pictogram changes appearance, I don’t know why. Can you help me / give me the lines of CSS code so that the pictogram looks as it should?

I’m attaching two screenshots to this request to show you the display problems. 

I look forward to hearing from you! 

Hugo

The page I need help with: [log in to see the link]