background picture not showing in some browsers

I recently purchased JP.Rooms for my website at www.laptop-onderdelen.be

In IE the background picture behind my left menu is showing but in IE en Firefox I only have a black color background.
How can I make sure that this shows up on all browsers?

Second question I would like my icons to be in the red color that my logo uses, now the are in a kind of orange.
How can I change that?

Many thanks in advance!

Hi there,
please change the image source for your background, because "tif" is not supported in FF and IE. Use "jpg" or "png"
www.laptop-onderdelen.be/images/algemeen/background.tif
And the color can be changed at the Template Options > Customizer > Primary Background / Button Background