Adding lines / getting rid of spaces in table (css vs html)

Hi everyone.

I am having issues making changes to html tables.
There are 2 things I want to do.

1) Getting rid of table space
If you go to the bottom of this page, you’ll see that I am a “split banana” because of the space between table lines.
http://www.bananadog.com/
I am using this code but it’s not working.
<table cellspacing=”0″ cellpadding=”0″ align=”center”>

2) Adding a border line to table
http://www.bananadog.com/banana/
I am using this code but it’s not working.
<table width=”100%” border=”1″ align=”center”>

Although the codes look correct, it’s not being reflected on the page. I am assuming this is something to do with css.

Is there any way I can make changes to html tables individually in wordpress pages?

I know that this is a very simple issue, but I would very much appreciate your support.

Thanks very much!

Best,
Banana Dog