Aligning buttons below text blocks - 7.0 Brine template

I've added a new index page to an old Brine template website.

I have a section with four text blocks in a row and a button underneath each. I want to force the buttons to align underneath so they are in a neat row on desktop and tablet. (They are stacked on mobile, so it doesn't matter.)

This is the index page: https://completeprojects.co.uk/legal-services (Password: legal)

The relevant section is 'Ways To Work Together'.

Is there a coding solution to ensure the buttons align? I half remember there is a way to force the height of the text box. Or perhaps it was another type of block?

Thanks for your help

Add to Design > Custom CSS

/* align ways to work together buttons */
@media screen and (min-width:901px) {
section#legal-services-how-we-can-support-you .span-2 p:last-child {
    min-height: 170px;
}
}