Add border to tables

Hi, I'm trying to add borders to tables that I created, but every time I put in a <table> tag, only the top and bottom line of the table appears. I also I want to add colours to the table cells. How do I get rid of the default table settings? I use a child theme. Site is here:http://www.trendskitchens.co.nz/yamaha_wp/wordpress/?page_id=8 Thank you :)