How can I make my drop down neater?

I would like it so that the drop down box does not overhang the background box - hopefully the screenshot explains the issue I am having.

Please insert this custom CSS code to increase the width of the box where the drop down is.

#cid_17 {
width: 180px;
}

Here's a guide on how to inject custom CSS on the form. Here's the result:

Hope that helps. Thank you.