Preventing testimonials row from changing height

When a testimonial slider comprises a row on a page, testimonials of different lengths cause the row to increase / decrease in height slightly.

For example, a testimonial with three lines of text will cause the row to increase in height slightly, while a testimonial with only two lines of text will cause the row to decrease in height slightly.

Is there a way to keep the testimonial slider row the same height, regardless how mucg text each testimonial has?