Logo stretching in cell phone view

Hello, My logo looks great in regular view. I have responsive enabled, and when I click on cell phone table view it gets stretched. How do I keep it from stretching in these other views. http://wholefamtherapy.com/wp-admin/customize.php?return=%2Fwp-admin%2Fthemes.php%3Fpage%3Dtheme_options Thanks, Travis