how to put a border on the table 'tr' in html code example

Example 1: html create a table

<html>
 <head>
   <title>Working with HTML Tables</title>
 </head>
 <body>
   <table>				<!-- create an table object -->
     <tr>				<!-- "tr" represents a row -->
       <th>Name</th>	<!-- use "th" to indicate header row -->
       <th>Date of Birth</th>
       <th>Weight</th>
     </tr> 
     <tr>				<!-- once again use tr for another row -->
       <td>Mary</td>	<!-- use "td" henceforth for normal rows -->
       <td>12/13/1994</td>
       <td>130</td>
     </tr>    
   </table>
 </body>
</html>

Example 2: table css

tr , th , td  {
    border: 1px solid black;
    padding: 5%;
    text-align: center;
}

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