CSS code doesn't make borders for my table

I coded to make a simple table with three rows and one column. That worked fine. But, trouble comes while making 1 px borders around the table using css. It doesn't make any border.

index.php class:

<!DOCTYPE html> 
<html lang="en"> 
<meta charset="utf-8"> 
<title>My site</title> 
<table class="t"> 
<tr><td>first row</td></tr> 
<tr><td>second row</td></tr> 
<tr><td>third row</td></tr> 
<script type="text/javascript" src="js/jqry.js"></script> 
<script type="text/javascript" src="js/selector.js"></script> 

Creating a CSS drop down menu which still activates a jQuery Filter

I found the following page which gives a neat filterable jQuery gallery:


I have used this on our new test site:


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