1.纯css3渐变背景

.bg{

  background:linear-gradient(135deg,#5e5ae2,#0188cc,#0188cc,#0188cc,#00b7ee);

}

2.纯css3渐变背景和背景图片混写

.bg{

  background:url(../images/main01bg.png) no-repeat center bottom, linear-gradient(135deg,#5e5ae2,#0188cc,#0188cc,#0188cc,#00b7ee);

}