background-image: linear-gradient(red, yellow);
/*to right*/
background-image: linear-gradient(to right, red , yellow);
/* bottom right*/
background-image: linear-gradient(to bottom right, red, yellow);
/*dissolve deg*/
background-image: linear-gradient(-90deg, red, yellow);
/*multi color to right*/
background-image: linear-gradient(to right, red,orange,yellow,green,blue,indigo,violet);
/*disolve gradient*/
background-image: linear-gradient(to right, rgba(255,0,0,0), rgba(255,0,0,1));
/*radial gradient*/
background-image: radial-gradient(red, yellow, green);