border color for table row

Hi,

  I'm trying to do something very simple: give every cell in a sap.m.Table a border. I apply the border to the cell in a css file like so:

#__item5-myTableList-0_cell0, {

  border-color: black;

}

where __item5-myTableList-0_cell0 is the id of the html <td> tag in question

However, the border only applies at the top and the bottom, not left or right. I have attached a screenshot. As you can see, there are no lines left or right. Am I doing something wrong?