Hi there,
The content is wider than the screen
The content on your page is wider than than the viewport, so when viewed on a mobile device, it causes users to have to scroll horizontally. Therefore, you’ll need to try resizing the content of the page (text, images, etc>) so that it is not wider than the mobile screen.
You can find more information about the mobile device requirements here: https://developers.google.com/webmasters/mobile-sites/mobile-seo/configurations/?hl=en
Clickable elements are very close together
Google states:
Small or tightly packed links or buttons are more difficult for users to accurately press on a touchscreen than with a traditional mouse cursor. To prevent users from being frustrated by accidentally hitting the wrong ones, tap targets should be made sufficiently large and far from other tap targets that a user can press them without their finger pad overlapping any other tap targets. The average adult finger pad size is about 10mm wide (a bit less than half an inch), and the Android UI guidelines recommend a minimum tap target size of roughly 7mm, or 48 CSS pixels on a site with a properly-set mobile viewport.
Please read the support page for more information on elements.
Hope this helps.