How can I fix the button width?

How can I fix the button width?

Hi,

I've set up a new template. I'm having an issue with the buttons, is there a way to make sure they are all the same width? I can't find an option, is there some code I can copy?

I appreciate any help... here's a screen shot - to make it neater, we would like the buttons the same width.

Thank you in advance.