Responsive landing page using css Grid and Javascript

Hello there! I appreciate your help on this one, I couldn't make possible when I click on the button share (1200px view), I want not to disappear the box called "zonainfo". But I want that to be disappeared when I click on the share button at 375 px. At this moment it is working fine at low resolution, but not as I want with high resolution as you can see.

I appreciate your feedbacks, javascript supernewbie here.