You can import one CSS from another using the @import keyword:

@import "style.css";
@import url("http://some-site/style.css");

Note the url keyword here. You can refer to web resources for things such as cursors or fonts using this keyword.

Talking about fonts, you can use CSS @font-face to declare a font in CSS:

    @font-face {
        font-family: 'myFont';
        font-style: normal;
        font-weight: normal;
        src: url('myfont.ttf');
    }

Here, font-family denotes a name you can now use in CSS or Java code.