Hello @Haumesser,
Thanks for asking. 
First I would suggest you to have a single column layout for social share elements. After that inspect the row inside section that’s holding the social icons and under Customize > Class assign a class name. Here is a quick screencast. Next, add following CSS under Pro > Theme Options > CSS:
.social-icons-class {
display: flex;
justify-content: center;
}
Please replace social-icon-class as per your own requirement.

If you would like to learn CSS, I am sharing few resources that you take a look to get started with CSS and an interesting tool that you can use to speed up the development process.
I recommend you to watch following video that will help you to get started with CSS.
https://www.youtube.com/watch?v=MFR4WXiLzpc
Sometimes it can get a bit difficult to find out the right selector to be able to write the required CSS codes. A handy tool that can help you in this is Google Chrome dev tools. I am sharing the resource that you can refer to get started with dev tools.
https://developers.google.com/web/tools/chrome-devtools/css/
https://developers.google.com/web/tools/chrome-devtools/
https://www.youtube.com/watch?v=tP_kXBJWPhQ&t=200s
Thanks.