How to customize X link in the Search widget

Hi,

Theme I am working on does not contain any blue elements, and I cant figure out how to change “X” link for clearing content which is typed in the search field.

This link appear only when visitor start typing something into Search field. “Inspect element” option gives me just this:

div#clear 11px x 11px

I would like to change it to something else, or at least to change color of the element so it fits general style of the theme.

Any advice would be helpful.