The gridlines in my table won't go thicker
I am in pages and I am doing a table and I am trying to make a line in my grid thicker. I've tried to increase the thickness my writing down the pt which I want and it doesn't go, and I also tried to choose one of the options, it was there but every time I clicked it nothing happened.. So please help me!
MacBook Air, OS X Yosemite (10.10.3)