Curve bottom side of the div to the inside with CSS

Question

I would like to curve the bottom side of this rectangle div/background with CSS, so the result is something like this:

Does someone have an idea perhaps how it cou

Answer 1

Simply use border-radius and rely on some overflow. You can also consider pseudo element to avoid extra markup:

.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;
}

---

You can also use radial-gradient if you want a transparent shape:

body {
  background: pink;
}

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

---

And here is another way using clip-path

.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%);
}

You can also consider SVG:

.container {
  margin: 0 auto;
  width: 500px;
  height: 200px;
  background: url("data:image/svg+xml,") top center/auto 700px no-repeat;
}

---

Here is an example if you want also to add border around your shape:

.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;
}

---

If you want to have an image or gradient as background with the transparency, use mask-image:

body {
  background: pink;
}

.container {
  margin: 0 auto;
  width: 500px;
  height: 200px;
  -webkit-mask-image: radial-gradient(110% 50% at bottom, transparent 50%, #fff 51%);
          mask-image: radial-gradient(110% 50% at bottom, transparent 50%, #fff 51%);
  background: linear-gradient(45deg,red,yellow,blue);
}