How to get additional details for PHPStorm warnings?

Question

I got the following warning:

Optimize background properties

This inspection tries to find similar CSS properties, which can be transformed to shorter form (shorthand; padding for individual sides can be shortened to 'padding' shorthand if possible, etc).

on this line of CSS:

background: url('../icons/loading.gif') no-repeat right center;

Is there a way to know what PHPStorm wants me to do with my CSS declaration?