Interesting read: https://graphicdesign.stackexchange.com/questions/199/point-vs-pixel-what-is-the-difference
In CSS
A pt is 1/72 of an in, and a px is 1/96 of an in.
A px is therefore 0.75 pt [source].
In CSS, everything is somewhat abstracted, so a unit such as a "pt" is
not necessarily one point in physical size, especially on a screen, an
"in" is not necessarily one inch in size, and so forth. Even a "px" is
no longer necessarily one pixel in size anymore: Everything is scaled
to be consistent with a hypothetical 96 ppi device viewed at normal
reading distance, meaning that on screens that differ significantly
from 96 ppi or from normal reading distance, everything will be
scaled, but still maintain the same relationships ie a pt will still
be 1.33334 px units and still be 1/72 of an in unit.
In print
In print, a point was traditionally somewhere from around 1/67 of an
inch to 1/72.5 of an inch.
In digital mediums, it has become a de-facto standard for a point to
be exactly 1/72 of an inch nowadays, though there are still
alternative measurements in less common use which vary slightly from
1/72, but not by much.
In print, you don't usually measure in pixels, because they are a
technical detail about the target printer or device that are not an
absolute measurement. For instance, a design may be printed at 125
dpi, 300 dpi or at 1200 dpi and still be the same physical dimensions.
As for scrolling in sketch, did you try to hold spacebar while dragging (hand tool)?
