Composition✏️ Edit this page
Composition is one of the most powerful and useful patterns in Emotion. You can compose styles together by interpolating value returned from
css in another style block.
With regular css, you can compose styles together using multiple class names, but this is very limited because the order that they're defined is the order they'll be applied. This can lead to hacks with
!important and such to apply the correct styles.
For example, we have some base styles and a danger style, we want the danger styles to have precedence over the base styles but because
base is in the stylesheet after
danger its styles will override the styles defined in
danger, as per the cascade rules. In regular CSS, you might do something to make
danger take precedence over
base like moving the
danger class so it's defined later than
base, or use
!important, or abandon composition and rewrite the styles each time you need them.
With Emotion though, you can create styles and combine them.
Using Emotion's composition, you don't have to think about the order that styles were created because the styles are merged in the order that you use them.