向上-向下箭头

/* 箭头 */
.chooseRightArrow {
position: absolute;
right: 16px;
//top: 5px; // 位置 顶部
width: 50px;
height: 50px;
margin-top: 5px;
text-align: center;
line-height: 20px;
}
.chooseRightArrow:before {
content: "";
position: absolute;
width: 10px;
height: 10px;
border: 1px solid #bbb;
border-width: 1px 0 0 1px;
transform: rotate(-225deg);
top: 20px;
right: 5px;
}
}