/*PC端*/
.banner{
  display:flex;
  position:relative;
  margin-top:70px;
  flex-direction:column;
  height:500px;
  font-size:24px;
  font-weight:bold;
  color:#fff;
  letter-spacing:3px;
  justify-content:center;
  align-items:center;
  background:url(../images/supportbg.jpg) center;
  background-size:100% 100%;
}
.banner span:nth-child(2){
  font-size:32px;
  letter-spacing:10px;
}
.content{
   display:flex;
   height:500px;
   justify-content:center;
   align-items:center;
   background:#f5f5f5;
   font-size:24px;
   font-weight:bold;
}
/*手机端*/
@media screen and (max-device-width:960px){
  .banner{
    height:auto;
    margin-top:4rem;
    font-size:0.7rem;
    height:6rem;
  }
  .banner span:nth-child(2){
     font-size:0.8rem;
  }
  .content{
     height:5rem;
     font-size:0.8rem;
  }

}