How do I get rid of these lines to make them smooth?
You need to edit .tborder in your global.css
and put the following css code in .tborder
-webkit-border-top-left-radius: 8px;
-khtml-border-radius-topleft: 8px;
-moz-border-radius-topleft: 8px;
border-top-left-radius: 8px;
-webkit-border-top-right-radius: 8px;
-khtml-border-radius-topright: 8px;
-moz-border-radius-topright: 8px;
border-top-right-radius: 8px;
or change the 10 to whatever you need, change it to the same one thead is at.
edit: nevermind, changed it for you. its 8