display:flex兼容性，

部分手机flex布局下对justify-content: space-evenly;属性兼容性不够好，

解决方法

flex-box{
      display: flex;
      flex-flow: row nowrap;
      align-items: center;
      justify-content: space-between;
       /*justify-content: space-evenly;*/
    
}
flex-box::before,flex-box::after{
        content: "";
        display:block
}