CSS is the basic answer.
First give your <table> an "id" attribute. You could also use the "class" attribute but I used the "id" for the example below.
Second, place this in the <head> of your page.
<style>
#mytableid td {
color: #FFFFFF;
}
</style>
The "#FFFFFF" is white and you could replace it with the word "white" but in the long run your going to want to learn RBG or hexadecimal color codes so you can use all 16 million colors that are available to you.
And should you want the table background black insert this in the <style>
#mytableid {
background: #000000;
}
If you aren't familiar with CSS you can learn more about it at W3School.com as well you can use the CSS section as a reference guide for any other CSS you need to do.
CSS is inseparable from HTML and a very powerful tool, if you don't know how to use it I high recommend you take the time to learn it.