One of the ways where we use style tag if you cannot use external css :-
<style>
table{
border:1px solid black;
border-radius:10px;
}
</style>
<table>
<tr><th>Name</th><th>Age</th></tr>
<tr><td>Lak</td><td>14</td></tr>
<tr><td>Raj</td><td>17</td></tr>
<tr><td>Sheldon</td><td>15</td></tr>
<tr><td>Leonard</td><td>19</td></tr>
</table>
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…