/* 官网主色调 */
body {
  background-color: #191a1d;
}
.header {  background: rgba(0,0,0,0.8)}
.main{
  height: 500px;
  background:#fff;
  text-align: center;
  padding-top: 200px;
  color: #333;
  font-size: 24px;
}
.main > div {
  width: 321px;
  height: 210px;
  margin: 0 auto;
  background:url('../img/active01.png') no-repeat center;
}