Horizontal alignement for widgets lists

Hello !
I am playing with Writers-blogily theme and I encounter a problem with one of the social media plugin that I use (sassy social share). In the widget containing the links to my social media accounts, they appear one below the others and not next to each others (vertically and not horizontally as they are supposed to be)
Here is the link to my site: https://www.karine-rennberg.com/blog/

When changing theme, they appear normally (horizontally), so the problem comes from W-B theme (probably something around parameters in “ul” and “li”). I have tried to deal a little with CSS, but failed.

Can you please tell me how to resolve this issue ?