Can one http request call multiple css files?

Can one http request call multiple css files?

Is it possible to add multiple css in header tag with one http request to
execute all css file at once ?
I know about
@import url('/css/typography.css');
@import url('/css/layout.css');
@import url('/css/color.css');
can we do something like or any other solution to reduce http requests
<link rel='stylesheet' href='/css/typography.css,layout.css,color.css'>