Configure / tune Reader Mode margins, especially on larger devices

[dredmorbius]

Using an Onyx BOOX 13.3" device, the margins in Reader Mode run uncomfortable close to the sides, top, and bottom of the display. I'd much prefer more whitespace around the document text. Mozilla Fennec Fox Reaer Mode and the Pocket reader (either Web client or Android app) both offer much wider side margins, about 30mm for Fennec Fox and about 15--20mm (varies by font size) in Pocket.

Text excessivly close to margins becomes difficult to read.

Either increasing defaults or offering a user control for this would be appreciated.

[plateaukao]

Hi, @dredmorbius
I'll try to add an option in Settings to allow wider margins in case users are using larger eink devices.

[dredmorbius]

See also #34

[dredmorbius]

Updating assets/readerview.css to read:

.mozac-readerview-body {
  padding: 10px;
  background-color: #ffffff !important;
  color: #000000 !important;
  margin: 10%;
}

Where the additional property is a 10% margin, would address most of my concerns.

10px for a 13" 220 dpi device ... is vastly insufficient.

A 10% margin should scale proportionately for all devices.