.top_fon {
background: linear-gradient(rgb(255,255,255,0.8), rgba(255,255,255,0));
}
background-image: -webkit-gradient(linear, left top, left bottom, from(rgb(255,255,255,0.8)), to(rgba(255,255,255,0)));
background-image: -webkit-linear-gradient(rgb(255,255,255,0.8), rgba(255,255,255,0));
background-image: -o-linear-gradient(rgb(255,255,255,0.8), rgba(255,255,255,0));
background-image: linear-gradient(rgb(255,255,255,0.8), rgba(255,255,255,0));