Random css style generator

i'm creating a css style generator for 'semi-dark' spacehey profiles. It's a bash script. I'm not good at bash scripting, or ccs or even html, so, i use it as a training.

these are some of his features:

50% change of getting a uniform color for borders and background headers (added)
it chooses randomly from 12 color for dark and light text and background
there's a 50% chance of getting rounded corners
there's a 50% chance of swapping .top header and .links menu
there's a 50% chance of swapping .left and .right colums
the size of the border has also a range of 1 to 3 px.
it chooses randomly from 22 fonts for main text and 22 for headers
the background is random too, but it's just landscapes.

i'm planning to polish some things and adding more changes, there's a lot or room for improving. here are some samples tested in one random profile.