Categories widget too wide for sidebar

Just open a random post on my blog.

Ex. : https://techtage.com/2013/03/concept-smartphone-with-customisable-hardware/

You can see the there’s a categories widget on the sidebar on the left. As the titles of a few categories are long, the drop-down menu is also very wide, as even long titles are shown in the same line of text. What I want is, a feature like max. characters # something, after which the rest of the title will appear below, in the next line, so the widget stays within the sidebar.

Any help would be gratefully appreciated.

On a side note, is the text on my blog hard to read because of the white-on-blue setup?

Regards,
Rohit

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