From a purely "make it fit in the div" perspective, add the following to your table class (jsfiddle):
table-layout: fixed;
width: 100%;
Set your column widths as desired; otherwise, the fixed layout algorithm will distribute the table width evenly across your columns.
For quick reference, here are the table layout algorithms, emphasis mine:
- Fixed (source)
With this (fast) algorithm, the horizontal layout of the table does not depend on the contents of the cells; it only depends on the table's width, the width of the columns, and borders or cell spacing.
- Automatic (source)
In this algorithm (which generally requires no more than two passes), the table's width is given by the width of its columns [, as determined by content] (and intervening borders).
[...] This algorithm may be inefficient since it requires the user agent to have access to all the content in the table before determining the final layout and may demand more than one pass.
Click through to the source documentation to see the specifics for each algorithm.