There's a visible </tr> tag on the Hexadecimal chapter of the CSS tutorial.

[Here](http://marksheet.io/css-color-units.html#hexadecimal), there's an extra `</tr>` tag [visible](https://s31.postimg.org/sghbrzzbf/Screenshot_from_2016_08_04_23_34_33.png) which should not be.
