Changing Image Border Color

Hi,

I am using the Arcade Pro Theme and when i insert images into a page, it gives the images a white border. The website’s pages are all black with white text on them and I don’t like the White border around the images.

Is there a way to change the default inserted image border from White to Black using CSS inserted into the CUSTOM CSS EDITOR section under Appearance? I would also like to have the Description text changed from Black to White (so you can read them when the border is changed to black).

I know just short of nothing about CSS, hence I thought I would ask all the GURU’s here.

If you can help thanks!

img {
border: 4px solid #000;
}