Edit some features

[jarrekk]

Hi @cognitom ,

I have edited some places, maybe it will be helpful for you:

1. At Paper sizes in paper.css, I make paper at middle of screen to make it looks better.
2. I add class continuous to make paper display continuous if you want, so I can use wkhtmltopdf to make html page to pdf without page overflow.

Then I compress paper.css again.

Thanks

[cognitom]

Hi @JiaKunUp, thanks for you PR.
continuous seems good idea. I like it 😄

[cognitom]

I'm not sure the benefit of this. Could you pls explain it?
Anyway it seems better to write it in another line:

.sheet { margin-left: auto; margin-right: auto }

[jarrekk]

@cognitom Thanks for replying, if I add these, papers will be displayed at middle of screen like:

not on left side of screen, only looks good😁

[jarrekk]

And I write at this place to make paper displayed at center default. If you think this feature is optional write it in another line is OK.

[arivera12]

I have open an issue asking for centering the sheets as this PR. #20. I think centering the sheets is great for visual purpose for the clients/users a and I think it should be centered as default. I always for default center all the sheets using this:

.sheet {
     margin: 0 auto;
}

Think about MS Word, or any other printing tools. Sheets are centered for default. Centering sheets for print is like a standard for the clients/users.