Installation

First, you have to import uss.unitypackage.

Setup

Once you import the package, there will be UssRoot in Canvas object. If there isn’t, please add UssRoot component to Canvas.
_images/ussroot.pngussroot

Next, create a ucss file to somewhere proper place. (ex: Assets/Resources/default.ucss)

_images/ucss_slot.pngucss_slot
There’s a Ucss slot in UssRoot.
Drag the .ucss file you just created to the Ucss.

You can specify different files for each scene.

Load ucss with code

You can also load ucss in with code.

var ucss = System.IO.File.ReadAllText("PATH_TO_LOAD");

UssStyleModifier.LoadUss(ucss);

LoadUss can be executed in runtime. But this can hang your application in few moments.