Need help with mobile fashionistas

Hey guys,
I’m using the fashionistas theme, and it looks great on my desktop. However on mobile it looks absolutely horrible, there are a number of issues which I’d appreciate some help solving:
1. The black top menu stops being black about halfway along and for some reason turns white.

2. The text on the post previews is too close to the edges of the mobile device, and so is the menu button below the header, making it difficult to press on. The text is also too close to the edges when you’re actually reading an article, making it difficult to read.

3. I’ve installed a plugin to show image previews of recent posts on the sidebar, which looks fine on desktop. On mobile, the side bar is on the bottom of the page (as expected). The images used in it aren’t centred and for some reason differ in size.

If anyone would be able to help me out i’d really appreciate it. I’ve got an editor plugin ready and waiting.

The site is https://www.tenblog.net

Thank you