That's what controls how big your entry is. It's set to be 600px off to the left, and 50% of the total space (so anther 600px). You can change the "left:600px;" if you don't want it to be so far over, or you can change the "width: 50%;" so the entry space isn't so wide. You can set it to be a different percent or a set number of pixels. For my variation, I did "left: 0;" and "width: 100%;"
...I think that's the answer, anyway. I changed a lot of things and did most of it by trial and error, so let me know if it doesn't work.