css 备注箭头 兼容ios

    content: " ";
    position: absolute;
    right: 0;
    width: 0;
    height: 0;
    border-right: 50px solid transparent;
    border-left: 50px solid transparent;
    border-top: 50px solid rgba(64,170,166,1);
    z-index: 5;/*兼容ie8-*/