i标签的倒立小三角

.search .close {
border-width: 6px;
border-color: #fe6601;
border-top-width: 0;
border-style: dashed;
border-bottom-style: solid;
border-left-color: transparent;
border-right-color: transparent;
position: absolute;
top: 6px;
right: 8px;
}
.open {
display: inline-block;
border-width: 6px;
border-color: #999999;
border-bottom-width: 0;
border-style: dashed;
border-top-style: solid;
border-left-color: transparent;
border-right-color: transparent;
position: absolute;
top: 6px;
right: 8px;
}

i标签的类名动态更改就可以称谓上下样式的小三角，open是灰色隐藏状态 close 是黄色打开状态