.tcnr{
width: 15.3rem;
height: 5.325rem;
background: rgba(245,247,254,1);
border: 0.05rem solid rgba(161,187,250,1);
position: relative;
}
突出小箭头里的颜色
.tcnr:before{
box-sizing: content-box;
width: 0rem;
height: 0rem;
position: absolute;
top: -0.4rem;;
left:1.825rem;
padding:0;
border-bottom:0.2rem solid #F5F7FE;
border-top:0.2rem solid transparent;
border-left:0.2rem solid transparent;
border-right:0.2rem solid transparent;
display: block;
content:'';
z-index: 12;
}
突出小箭头
.tcnr:after{
box-sizing: content-box;
width: 0rem;
height: 0rem;
position: absolute;
top: -0.45rem;;
left:1.8rem;
padding:0;
border-bottom:0.225rem solid #A1BBFA;
border-top:0.225rem solid transparent;
border-left:0.225rem solid transparent;
border-right:0.225rem solid transparent;
display: block;
content:'';
z-index:10
}