You can just use the selector below
Demo
Demo 2 (several lines)
.mytable tbody tr:first-child td:nth-child(5) { }
Explanation: The above selector selects the 5 td element that is nested in the 1 tr element, which is further nested in the tbody , which is further nested in ANY element that has the .mytable class, but obviously tbody can be used inside the table , but if you want to do its specific, you can change this .mytable to table.mytable
Or you can use
.mytable tbody tr:nth-child(1) td:nth-child(5) { }
Explanation: Same as above using nth instead of first-child
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