纯CSS3+DIV实现小三角形边框效果的示例代码

html代码是这样的
<div class="arrow-up">
     <!--向上的三角-->
</div>
<div class="arrow-down">
    <!--向下的三角-->
</div>
<div class="arrow-left">
    <!--向左的三角-->
</div>
<div class="arrow-right">
    <!--向右的三角-->
</div>
 
狼蚁网站SEO优化用CSS3分别实现向上、下、左、右的三角形
/箭头向上/
.arrow-up {
    width:0;
    height:0;
    border-left:30px solid transparent;
    border-right:30px solid transparent;
    border-bottom:30px solid #fff;
}
    
 /箭头向下/
.arrow-down {
    width:0;
    height:0;
    border-left:20px solid transparent;
    border-right:20px solid transparent;
    border-:20px solid #0066;
}
    
 /箭头向左/
.arrow-left {
    width:0;
    height:0;
    border-:30px solid transparent;
    border-bottom:30px solid transparent;
    border-right:30px solid yellow;
}
   
/箭头向右/
.arrow-right {
    width:0;
    height:0;
    border-:50px solid transparent;
    border-bottom: 50px solid transparent;
    border-left: 50px solid green;
}

<view class="index_sale_lists">
      <view class="sanjiao"></view>
      <view class="index_sale_list">
        <view class="index_sale_choice">你已选择<text>上脑</text></view>
        <view class="index_sale_tezhi">
          <text>
            特质牛上脑是位于肩颈部靠后，脊骨两侧的牛肉，肉质细嫩多汁，脂肪杂交均匀，有好看的大理石花纹，口感绵软，入口即化，脂肪低而蛋白质含量高，适合涮火锅，可煎炸，炸和烧烤。
          </text>
        </view>
      </view>
    </view>

.index_sale_lists{
  margin: 50rpx 24rpx 0;
  background-color: #F2F6F4;
  border-radius: 20rpx;
  position: relative;
}
.sanjiao{
    position: absolute;
    left: 50%;
    :-15rpx;
    width:0;
    height:0;
    border-left:10px solid transparent;
    border-right:10px solid transparent;
    border-bottom:10px solid #F2F6F4;
    / z-index:-1; /
}