css 給網頁中的背景設置漸變色，css的漸變顏色可以指定固定的兩個顏色之前的線性過度，這個css3屬性只支持高版本的瀏覽器。

//瀏覽器前綴
background: linear-gradient(red, blue);
background: -webkit-linear-gradient(red, blue);
background: -o-linear-gradient(red, blue);
background: -moz-linear-gradient(red, blue);

to top :顏色從下往上漸變：

background:-webkit-linear-gradient(to top, red, blue);
background:linear-gradient(to top,red,blue);

to bottom :顏色從上往下漸變：

background:-webkit-linear-gradient(to bottom, red, blue);
background:linear-gradient(to bottom,red,blue);

to left :顏色從右往左漸變：

background:-webkit-linear-gradient(to left, red, blue);
background:linear-gradient(to left,red,blue);

to right :顏色從左往右漸變

background:-webkit-linear-gradient(to right, red, blue);
background:linear-gradient(to right,red,blue);

to right :顏色從左往右漸變

background:-webkit-linear-gradient(to right, red, blue);
background:linear-gradient(to right,red,blue);

to bototm right :顏色從左上角度到右下角漸變

background:-webkit-linear-gradient(to right, red, blue);
background:linear-gradient(to right,red,blue);

to top left :顏色從右下角度到左上角漸變

background:-webkit-linear-gradient(to right, red, blue);
background:linear-gradient(to right,red,blue);