Mobility is king… and Google is changing along with the way we use the web.
http://www.huffingtonpost.com/2015/04/17/google-search-update_n_7085642.html
It’s probably the most significant change that Google Inc. has ever made to its mobile search rankings, according to Matt McGee, editor-in-chief for Search Engine Land, a trade publication that follows every tweak that the company makes to its closely guarded algorithms.
Check out https://www.google.com/webmasters/tools/mobile-friendly/ to see if your site is going to work and what changes you might need to make.