When making web page, content is the most important thing that should be easily accessible all the time.
But this website fails by putting the share button on the left. In the smaller screen, it put the share button fixed at the bottom of the screen. But in wider screen, like the screenshot, it put the share buttons on the left. It’s fine when the screen is wide enough with margin around the content. But in landscape orientation of smartphone, this is a fail on the most basic principle—Content is the most important thing.
p.s. This is not the website of the app mentioned. It’s just a coincidence. I was searching what app to record the iPhone screen. The screenshot was from a blog.