Hi,

New to site designer and can't seem to figure out how to align items centrally and make them stay centre aligned as the browser is stretched and shrunk. I've been working with CMS' for a while now so the centre stretch has become second nature to me.

Hi Christine,
Without looking at your project or frame work this may not be correct but margin Auto for left and right will work on block elements.

Hello Christine
There are a number of ways to do that
depending on which framework you are using within Site Designer
It is always a good idea on this forum to let us know which one you are working on, although some solutions are relevant to all, others are not, or are at least slightly different approaches.
Having that knowledge will help us to provide a specific solution for your problem

ooops looks like Eric sort of beat me to it,

There are indeed several ways. Eric's answer is usually the quickest way.

Using Flexbox can be helpful as it gives many options, including vertical centering as well as horizontal centering, and centering more than one element. Details are at here in the User Guide.

Frank

Or you can watch one of my "Learning by Participation" videos if you are using the foundation framework I did some for another user a while ago I found them and have updated one so far about using "Flex" the others will be updated next.