Hi Marjolijn,
Please try to use browser developers tools to inspect element and see how CSS is applied. See this: https://screencast-o-matic.com/watch/cbX6n72I9H
.post-type-archive-mec-events section#main-content {
max-width: 900px;
margin: 0 auto;
}
But that CSS seems the same with the previous one. Reason that might stop that from working is either CSS syntax error or cache. I am in the process of checking when your site stop loading. I was able to login on admin but then it just stops loading and the error is this This site can’t be reached
. Please check in with your hosting provider.
When I first check it on your source code before it stop loading I did not see that CSS on your site. See this:
. Did you remove the CSS?
For the next 2 issues, we can’t check at the moment because your site is down The screencast showing how to use browser dev tools will help you implement what you are trying to achieve though.