A better coding window

It seems like the coding window for computer programming (https://www.khanacademy.org/computer-programming/new/pjs) is always no more than 1197 pixels, which is tiny compared to my 1080p monitor. This makes it really annoying to code. Also, it's only 400 pixels high, meaning you can only see about 20 lines of code at once. Often I feel forced to code in a different text editor like Notepad++, and then copy/paste it to Khan Academy all the time which is really annoying. Please consider allowing us to resize the window to make it a lot easier to code.

Thanks in advance.