用CSS曲线底部的div到内部

Question

我想用CSS修改这个矩形div/background的底部,所以结果是这样的:

是否有人有想法如何实现？

.curved {
  margin: 0 auto;
  width: 800px;
  height: 500px;
  background: lightblue;
}

<div class="container">
  <div class="curved"></div>
</div>

Answer 1

只需使用边框半径并使元素溢出.您还可以依赖伪元素来避免额外的标记:

.container {
  margin: 0 auto;
  width: 500px;
  height: 200px;
  background: lightblue;
  position: relative;
  overflow: hidden;
}

.container:after {
  content: "";
  position: absolute;
  height: 80px;
  left: -10%;
  right: -10%;
  border-radius: 50%;
  bottom: -25px;
  background: #fff;
}

<div class="container">
</div>

您也可以使用径向渐变.如果您希望形状透明并且您的元素将在背景上方,那么这将是很好的:

body {
  background: pink;
}

.container {
  margin: 0 auto;
  width: 500px;
  height: 200px;
  background: radial-gradient(110% 50% at bottom, transparent 50%, lightblue 51%);
}

<div class="container">
</div>

这是使用clip-path的另一种方式(只需注意浏览器支持):

.container {
  margin: 0 auto;
  width: 500px;
  height: 200px;
  background-color: lightblue;
  position: relative;
  overflow: hidden;
}

.container:after {
  content: "";
  position: absolute;
  bottom: 0;
  right: -5%;
  left: -5%;
  height: 120px;
  background: #fff;
  -webkit-clip-path: ellipse(50% 60% at 50% 100%);
  clip-path: ellipse(50% 60% at 50% 100%);
}

<div class="container">
</div>

您也可以考虑使用SVG:

.container {
  margin: 0 auto;
  width: 500px;
  height: 200px;
  background: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64' width='64' height='48' fill='lightblue'><path d='M0 0 L0 16 C16 6 48 6 64 16 L64 0 Z' /></svg>") top center/auto 700px no-repeat;
}

<div class="container">
</div>

如果你想要更多

如果您还想在形状周围添加边框,这是一个示例:

.container {
  margin: 0 auto;
  width: 500px;
  height: 200px;
  border: 2px solid #000;
  border-bottom: 0;
  background: lightblue;
  position: relative;
  overflow: hidden;
}

.container:after {
  content: "";
  position: absolute;
  height: 80px;
  left: -10%;
  right: -10%;
  border-radius: 50%;
  bottom: -62px;
  background: #fff;
  z-index: 2;
}

.container:before {
  content: "";
  position: absolute;
  height: 82px;
  left: -10%;
  right: -10%;
  border-radius: 50%;
  bottom: -62px;
  background: #000;
  z-index: 1;
}

<div class="container">
</div>

Answer 2

检查这个。我用 :after 伪元素创建了这个。如果背景是纯色会很有帮助。

.curved {
  margin: 0 auto;
  width: 300px;
  height: 300px;
  background: lightblue;
  position: relative;
}
.curved:after{
  background: white;
  position: absolute;
  content: "";
  left:0;
  right:0;
  bottom: -25px;
  height: 50px;
  border-radius: 50% 50% 0 0;
}

<div class="container">
  <div class="curved"></div>
</div>