problem with website, the menu page colours goes in to 2 colours

I have a problem with my website. I have both pages and categories. When I have to see how it looks when I have written a new page, then something strange happens. I have just writ som changes on the page with the titled Translations, when I update my changes, the top of the box is white and the rest is gray. I need it's all to be white and I can not figure out what is going wrong. I really need help with this problem, and I hope you can help me. My website address with the page titel I'm talking about, is called : http://garnmasken.dk/oversaettelser/ I also need to create some tables with multiple columns on my website, it will be both in the site menu bar and in the category menu bar. I do not know if there is a plugin that can be used. It is both tables where there should be only text and tables where there should be a picture followed by a new column where I can write a description or explanation of the picture. I hope you can help me. The best regards from Anne-Pia Hansen