When specifying background, the box is not fully painted

[kigster]

Describe the problem

Given the following configuration for the TTY::Box.frame:

{
  align:        :left,
  border:       :round,
  enable_color: true,
  padding:      1,
  style:        {
    bg:     :yellow,
    fg:     :black,
    border: {
      fg: :red,
      bg: :yellow
    },
  },
  width:        114
}

The following is printed to my iTerm window:

Steps to reproduce the problem

style_args = {
  align:        :left,
  border:       :round,
  enable_color: true,
  padding:      1,
  style:        {
    bg:     :yellow,
    fg:     :black,
    border: {
      fg: :red,
      bg: :yellow
    },
  },
  width:        114
}

TTY::Box.frame(content, **style_args, &block)

Actual behavior

The window is printed, but the background does not fully pain the rectangle.

Expected behaviour

Full rectangle of the same background color.

Describe your environment

• OS version:
• Ruby version:
• TTY::Box version: