'How to remove different color borders

This is the HTML

<body>
    <table border="10" id="pog">
        <tr>
            <td>Hi</td>
            <td>Hi</td>
        </tr>
        <tr>
            <td>Hi</td>
            <td>Hi</td>
        </tr>
    </table>
</body>
this is the CSS
#pog{
    border-color:blue;
}

Look at how the blue box

the blue box is split with the two sides and they are different colors. How can I fix this?



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