### Author:  [@techAPJ](https://meta.discourse.org/u/techAPJ)
#### Post date: [February 8, 2016, 2:36pm UTC](https://meta.discourse.org/t/pastebin-onebox/29867/12 "2016-02-08T14:36:21Z")
Thats’s because if `max-height` property is not provided then the one line pastes takes up 150px height by default. Adding `max-height: 100px` limits that to 100px. See:
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### Author:  [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [February 8, 2016, 7:35pm UTC](https://meta.discourse.org/t/pastebin-onebox/29867/13 "2016-02-08T19:35:57Z")
Shouldn’t that be min-height then?
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### Author:  [@cpradio](https://meta.discourse.org/u/cpradio)
#### Post date: [February 8, 2016, 7:45pm UTC](https://meta.discourse.org/t/pastebin-onebox/29867/14 "2016-02-08T19:45:04Z")
Not exactly. Something is forcing iframes to be 150px tall. Need to figure out where that is happening to figure out how to properly fix it.
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### Author:  [@cpradio](https://meta.discourse.org/u/cpradio)
#### Post date: [February 8, 2016, 8:00pm UTC](https://meta.discourse.org/t/pastebin-onebox/29867/15 "2016-02-08T20:00:54Z")
Okay, big thanks to @RyanReese (who found the spec for me and solidified that I was on the right track), but unfortunately this is part of the CSS2 spec.
[Visual formatting model details](https://www.w3.org/TR/CSS2/visudet.html#inline-replaced-height) (search for 150)
In short, Chrome or whatever browser you are using is enforcing the 150px iframe size (so long as they follow the CSS2 spec).
So how do you reduce it or enlarge it based on the content of the iframe? With JavaScript ☹ There isn’t a CSS solution that can tell you the height of the iframe content (as that data exists on another page/site). So unless you can execute some JavaScript to get the inner height of the iframe before it is cooked, Discourse just has to pick a happy medium to ship with.
If you can, the idea would be to detect if it is greater than 100px, if it is, set the height style and max-height to 300px (to give it some room to show the user what data is there. Otherwise, set it to 100px for both attributes.
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### Author:  [@cpradio](https://meta.discourse.org/u/cpradio)
#### Post date: [February 8, 2016, 8:04pm UTC](https://meta.discourse.org/t/pastebin-onebox/29867/16 "2016-02-08T20:04:33Z")
Also, it would be ideal to handle these max-height/min-height/height styles in a class labelled pastebin-onebox so it is easier to override versus attaching it to the iframe via inline styles.
Maybe have a pastebin-onebox (which is the 100px setting) and a pastebin-onebox-large for the 300px setting
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### Author:  [@riking](https://meta.discourse.org/u/riking)
#### Post date: [February 10, 2016, 6:47pm UTC](https://meta.discourse.org/t/pastebin-onebox/29867/17 "2016-02-10T18:47:05Z")
> [@cpradio](#):
>
> If you can, the idea would be to detect if it is greater than 100px, if it is, set the height style and max-height to 300px (to give it some room to show the user what data is there. Otherwise, set it to 100px for both attributes.
You could have the oneboxing code download raw.php and use the ‘large’ if there’s more than 1 line.
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### Author:  [@techAPJ](https://meta.discourse.org/u/techAPJ)
#### Post date: [February 22, 2016, 11:06am UTC](https://meta.discourse.org/t/pastebin-onebox/29867/18 "2016-02-22T11:06:09Z")
> [@wil93](#):
>
> Only 3 lines are shown even if there are more…
Okay I fixed this issue by removing Pastebin iframe and instead extracting first 10 lines of a paste, similar to GitHub Gist onebox.
* * *
See the improved pastebin onebox demo here:
> **[How do I reply to folks here?](https://try.discourse.org/t/how-do-i-reply-to-folks-here/51/6)**
>
> I noticed there’s a few different ways to reply. I’m unclear which method of replying I should use, and when. Can anyone clarify this for me? Also how do I quote someone else’s post, as I have seen others do in replies here?
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### Author:  [@downey](https://meta.discourse.org/u/downey)
#### Post date: [February 22, 2016, 4:28pm UTC](https://meta.discourse.org/t/pastebin-onebox/29867/19 "2016-02-22T16:28:44Z")
This looks nice but it seems to struggle with long lines. The old one wrapped, but the new one does not. Anything that can be done for that?
Old one here until an update installed and the post is rebaked:
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### Author:  [@chapoi](https://meta.discourse.org/u/chapoi)
#### Post date: [December 4, 2025, 11:36am UTC](https://meta.discourse.org/t/pastebin-onebox/29867/20 "2025-12-04T11:36:00Z")