when zoom in browser cause one div container expand, how to adjust other div container length to keep the at a same bottom line?

HI I am now working on a webpage.In the page I have a left part and right part. The right part has a table view, and the left part just some buttons. it looks like this: It looks good now. but when I zoom in my browser to like 150%, 160%…, the right part(table) will expand its bottom vertically because of the content. like this: So you can see the bottom of two div are not aligned horizontally . So my question is how to keep this to bottom always in a same line. Yeah maybe you will say: fill