<div class="box"></div>
<div class="box"></div>
.box {
  height: 200px;
  background: red;
  margin: 10px;
}
.box:nth-child(1) {
  clip-path: ellipse(85% 100% at top)
}
.box:nth-child(2) {
  clip-path: ellipse(650px 100% at top)
}
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