Let's download the OpenLayers library. After you're done, you should have the OpenLayers library files set up on your computer. Perform the following steps:
v3.0.0.zipversion of the OpenLayers v3.0.0. It's the green button on the bottom left of the Github release page for v3.0.0.
v3.0.0(or whatever your version is).
v3.0.0folder. Once inside, you'll see a lot of folders, but the ones we are concerned with right now are the folders named
css, as seen in the following screenshot: