How to change the text position in a small heighted combo box component?

I have a combobox instance and it’s very small, the height value is only 19.

There are enough space for the text in it (in the combobox, not the opened list) to be shown, but just need to change the top margin of that text.

You will know my question easily by taking a look at my attachment:

I need to locate the text a bit higher like the one below, but by default, it’s like the upper one.