How can I create an inset curved background that works with a background gradient and overlapping transparent shapes?

Question

I have been trying to create a section of a webpage that looks like the image below with just CSS. I can not figure out how to create the curves the top and bottom of the ba

Answer 1

Here is how I would attempt it. It will probably take a bit of finessing to make it work for your site, but hopefully you can see the technique I used.

Basically you are using divs as the background to content and translating them to overlay. Then putting any content in a container that you can change the z-index on to bring above everything else. The curve itself is just a border-radius of 50% and skewed wider than tall. Then the content's parent div has the gradient color background.

I do like the simplicity of Temani's solution though.

/* top ellipse */
.top {
  border-radius: 50%;
  width: 150%;
  height: 200px;
  transform: translate(-15%, 20%);
  background: white;
}

/* content's parent container */
.mid {
  padding: 4rem;
  background: linear-gradient(-20deg, #3adecf, #3ae3c5);
}

.content {
  position: relative;
  z-index: 20;
  color: white;
  font-size: 30px;
}

/* bottom ellipse */
.bottom {
  border-radius: 50%;
  width: 200%;
  height: 200px;
  transform: translate(-25%, -20%);
  background: white;
}

.all {
  overflow-y: hidden;
  position: relative;
}

.t-circle {
  background: #00ccdd;
  position: absolute;
  top: 5%;
  right: -200px;
  z-index: 10;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  opacity: 0.2;
  pointer-events: none;
}

  
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