Fondo degradado con Css

[gVenom]

de hecho yo ayer mismo lei algo sobre el CSS3 y venian unas instruciones como

Código CSS:

/*linear gradient from green to blue, moving left to right*/
em { color: color-gradient-linear(0deg, 5% green, 95% blue) } 
    /*linear gradient from a transparent red to solid purple, top to bottom*/
em { color: color-gradient-linear(90deg, 5px rgba(100,100,100, 0.5), 200px purple) }
    /*linear gradient from green to blue to yellow, right to left*/
em { color: color-gradient-linear(180deg, 3px green, 50% blue, 100% yellow) }
    /*linear gradient from green to blue to green to blue ..., left to right*/
em { color: color-gradient-linear(0deg, 0px green, 10px blue, refle
 

pero no se si funcionan