Far too much of one colour, you should differentiate between maybe a black and a blue? Those coincide nicely in small doses, experiment with it and give us several different outcomes rather than just an all blue theme.
Off topic:
HTML & CSS have nothing to do with programming. I already brought it up with thiefmn6092 in the IRC and I think he messaged you. You should create a website development and design board categorised by Rails, PHP, Perl and other backend languages in one child board and then HTML, CSS, Less, SCSS in another child board with a few further frontend frameworks. If you keep HTML and CSS in a programming category it just makes the administrators come off as stupid.