API docs has responsive design patterns across different devices. However, the left white space looks inadequate when the device width is less than 400 px. Especially on 360px devices, the text is hidden, so hard to read it like this:

This may need to be fixed, since most mobile devices are less than 400px wide (usually 375px or 360px) as shown below:

(I captured this reference in Sketch 3 application.)