Pinyin Practice

Hi ,<br />
I have been looking everywhere on the internet for helpfull tools.<br />
Learning pronounciation on this ‘pinyinpractice’ is really great.<br />
<br />
I have a suggestion about colours.<br />
Choose black letters on a half transparent -red background is hard,I hope you condider to improve readability of most buttons. That would make your website the best.<br />
<br />
anyone agrees with this?