CSS 使用径向渐变的图像扇形边框

Question

我正在尝试使用 CSS 使用径向渐变为图像制作扇形边框。这是我目前所拥有的：JS FIDDLE.

如您所见，图像的上边缘是尖尖的，而下边缘是圆角的。我怎样才能在底部获得尖锐的提示？（就像底边倒过来一样。）非常感谢您的帮助！

HTML:

<body>
  <div class="top-container">
    <p>Top section.</p>
  </div>
  <div class="container">
   <p>Image Section</p>
  </div>
  <div class="next-container">
    <p>Bottom Section</p>
  </div>
</body>

CSS:

body {
  text-align:center;
  background: white;
}
.top-container {
  background: white;
  }
.container {
  position:relative;
    background-image: url("http://placekitten.com/1280/120"); 
    height: 100px;
    padding-top:40px;
    width: 100%;
    left: -10px;
}
.container::before { 
    position:absolute;
  bottom: -20px;
    left: 0px;
    width: 100%;
    content:" ";
    background: 
  radial-gradient(circle at 50% 0%, transparent 25%, #000 26%, white 0%);
  background-color: transparent ;  
    background-size:20px 40px;
  height:50px;
  background-repeat: repeat-x;
    background-position: -20px 0px;
}
.container::after { 
    position:absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    content:" ";
    background: 
  radial-gradient(circle at 50% 0%, white 25%, #000 26%, transparent 0%);
    background-color: transparent;  
    background-size:20px 40px;  
    height:50px;
    background-repeat: repeat-x;
    background-position: -25px 0px;
}
.next-container {
  background: white;
}

Answer 1

使用与顶部相同的径向渐变，但这里只是将其旋转 180 度

body {
  text-align:center;
  background: white;
}
.top-container {
  background: white;
  }
.container {
  position:relative;
  background-image: url("http://www.rhapsodazzle.com/flowers.jpg"); 
 height: 100px;
 padding-top:40px;
 width: 100%;
 left: -10px;
}
.container::before { 
  position:absolute;
  bottom: 0;/*-20px;*/
  transform: rotate(180deg); /* added */
  
 left: 0px;
 width: 100%;
 content:" ";
  background: radial-gradient(circle at 50% 0%, white 25%, #000 26%, transparent 0%);
  /*
  radial-gradient(circle at 50% 0%, transparent 25%, #000 26%, white 0%);*/
  background-color: transparent ;  
 background-size:20px 40px;
  height:50px;
  background-repeat: repeat-x;
 background-position: -20px 0px;
}
.container::after { 
  position:absolute;
  top: 0px;
  left: 0px;
  width: 100%;
 content:" ";
 background: 
  radial-gradient(circle at 50% 0%, white 25%, #000 26%, transparent 0%);
 background-color: transparent;  
 background-size:20px 40px;  
 height:50px;
 background-repeat: repeat-x;
 background-position: -25px 0px;
}
.next-container {
  background: white;
}

<body>
  <div class="top-container">
    <p>Top section.</p>
  </div>
  <div class="container">
   <p>Image Section</p>
  </div>
  <div class="next-container">
    <p>Bottom Section</p>
  </div>
</body>

JSfiddle link: jsfiddle.net/oq2ja51g/3/

CSS 使用径向渐变的图像扇形边框

CSS scalloped border for image using radial-gradients

css

radial-gradients