That can definitely be done, however, it does depend on what you want exactly. If you simply want to duplicate the bars, having one on the right side and one on the left of a different width, you would make those changes in the Layout Container Style section underneath the Overall Style & Config. section of the theme options tab.
If would look something like:
border-right: solid 10px #FFB70F;
border-left: solid 20px #FFB70F;
Obviously, you should change the hex code to the color you want, as well as change the px to the sizes you need.
I hope this helps!
If you want to replicate the text inside the border you showed me, then it would probably work out best to use an image, which gets a bit more complicated.