这是我的CSS。

CSS

#hexagon-circle { 
    width: 100px; 
    height: 55px; 
    background: red; 
    position: relative;
    border-radius: 10px;} 
#hexagon-circle:before { 
    content: ""; 
    position: absolute; 
    top: -25px; 
    left: 0; 
    width: 0; 
    height: 0; 
    border-left: 50px solid transparent; 
    border-right: 50px solid transparent; 
    border-bottom: 29px solid red;
    border-radius: 10px;} 
#hexagon-circle:after { 
    content: ""; 
    position: absolute; 
    bottom: -25px; 
    left: 0; 
    width: 0; 
    height: 0; 
    border-left: 50px solid transparent; 
    border-right: 50px solid transparent; 
    border-top: 29px solid red;
    border-radius: 10px;}

输出是六边形的4个边缘是弯曲的，但顶部和底部不是。我想使六边形的所有边缘弯曲。如何使上下边缘弯曲？或如何使三角形的上边缘弯曲？