div{width: 100%;height: 100px;}
body{background: url(../pic/2.png);}
/*#div1{background: #ff0000;}
#div2{background:#0000ff;}
#div3{background: #00ff00;}
#div4{background: red;}
#div5{background: rgb(0,0,255);}
#div6{background: rgb(100,50,200);}
#div7{background: rgba(150,150,0,0.5);}
#div8{background: hsl(120,50%,50%);}
#div9{background: hsla(120,50%,50%,0.5);}*/