Hi Jeffrey,
Sorry we misunderstood. We are thinking about the Calander in main content area.
You have added custom css for sidebars width 31%. so its conflict with our responsive css. To make the sidebar width 100% in mobile devices.
Go to Appearance -> Customize -> Ambition theme options -> Custom CSS paste the below CSS code and Click on Save & Publish button at the top of the options panel.
@media only screen and (max-width: 767px){
#secondary {
width:100% !important;
}
}
Thank you