#shape tool

in this post, the border is actually pretty simple (yay)! you can use ctrl+u to call up the shape tool or just click on it. you'll need to then right-click on that icon and choose rounded rectangle tool

these were my settings for a 540 x 540px gif but play around and see what you think looks nice!

if that's difficult to read, from left to right, we want: fill: none stroke: whichever color you want (in my case, it was white) at 2px (this will adjust the thickness of the border stroke options: straight, solid line (but there are options for a dashed line as well as dotted i didn't touch anything else after that 🤷‍♀️

to actually create the border, just click somewhere on your canvas and this menu will come up

this is where you adjust your dimensions and how curved you want the edges to be. these were my settings:

520px x 520px and left the radii at 10 for each corner

then i just used ctrl+t to drag it around the canvas until it snapped to perfect center!

the fun part of doing borders like this is you can make them any color, add layer effects like drop shadow, gradient overlays, etc. or even throw a texture over the top with a clipping mask! for just a rectangular border without the rounded corners, you would just choose the rectangle tool instead of rounded rectangle tool.

in that sub-menu, there's also the ellipse tool (hold shift while you drag the shape to make a perfect circle or input the same dimensions for width and height), polygon tool, line tool, and custom shape tool. highly recommend playing around with those guys (gn)!