<div class="wave"/>
<div/>
.wave {
  position: relative;
  height: 70px;
  max-width: 600px;
  width:100%;
  background: #d63e3e;
  margin: 0 auto;
}

.wave:before {
    content: "";
    display: block;
    position: absolute;
    border-radius: 100% 50%;
    width: 57%;
    height: 80px;
    background-color: white;
    right: -5px;
    top: 40px;
}

.wave:after {
    content: "";
    display: block;
    position: absolute;
    border-radius: 100% 50%;
    width: 51%;
    height: 70px;
    background-color: #d63e3e;
    left: 0;
    top: 27px;
}

External CSS

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External JavaScript

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