CSS, @import and @keyframes

To include CSS file "mystyle.css" in a CSS file, using

@import "mystyle.css";

or 
@import url("mystyle.css");

To create an animation in CSS, using @keyframes, example:
@keyframes mymove
{
from {top:0px;}
to {top:10px;}
}
/* Safari and Chrome */
@-webkit-keyframes mymove
{
from {top:0px;}
to {top:10px;}
} 

load to external web -font
@font-face
Reference:
http://www.w3.org/TR/CSS/ 
CSS framework:
http://blueprintcss.org/