header height and menu blocks

Hi Sakin, In the Adventurous theme, the dimensions of the header photo are fixed to 1600 x 400 px. However, we find 400px a bit too high. If I try to upload a photo of 300px high, it doesn't work and it will upscale to 400px. Is there a way to decrease the height of the header photo? And on a different website I'm using the Kathmandu theme and in that theme the menu-items have colored blocks around them. Can I implement that into Adventurous too?