Only thing that I can see and grant it, I'm a student here too, is that there is an extra space between the method names and the parentheses for their argument; example .height ("200px"); verses .height("200px");
Some text editors add actual content other than a blank space in its place. If you produced your jQuery in a text editor first and then pasted it into this course's browser environment, perhaps some unintended information was also transported in the process. At the least try removing those three extra spaces after the three method names; height, width and css, as well as the one before the border-radius value in the css method's argument.
On reading the additional replies above, it seems likely that Zain... hit upon the issue. It seems that Codecademy's environment is very particular when it comes to expected syntax structure.