Waves in pure CSS

by Faisal Khan Janjua

HTML

<div class="header">
  <!--Content before waves-->
  <div class="inner-header flex"></div>
  <div>
    <svg class="waves" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 24 150 28" preserveAspectRatio="none" shape-rendering="auto">
      <defs>
        <path id="gentle-wave" d="M-160 44c30 0 58-18 88-18s 58 18 88 18 58-18 88-18 58 18 88 18 v44h-352z" />
      </defs>
      <g class="parallax">
        <use xlink:href="#gentle-wave" x="48" y="0" fill="rgba(255,255,255,0.7" />
        <use xlink:href="#gentle-wave" x="48" y="3" fill="rgba(255,255,255,0.5)" />
        <use xlink:href="#gentle-wave" x="48" y="5" fill="rgba(255,255,255,0.3)" />
        <use xlink:href="#gentle-wave" x="48" y="7" fill="#fff" />
      </g>
    </svg>
  </div>
</div>
<!--Header ends-->

<!--Content starts-->
<div class="content flex">
  <p>Faisal Khan Janjua | 2019 | Free to use</p>
</div>
<!--Content ends-->

CSS

@import url(//fonts.googleapis.com/css?family=Lato:300:400);

body {
  margin: 0;
}

h1 {
  font-family: 'Lato', sans-serif;
  font-weight: 300;
  letter-spacing: 2px;
  font-size: 48px;
}

p {
  font-family: 'Lato', sans-serif;
  letter-spacing: 1px;
  font-size: 14px;
  color: #333333;
}

.header {
  position: relative;
  text-align: center;
  background: linear-gradient(60deg, rgba(84, 58, 183, 1) 0%, rgba(0, 172, 193, 1) 100%);
  color: white;
}

.logo {
  width: 50px;
  fill: white;
  padding-right: 15px;
  display: inline-block;
  vertical-align: middle;
}

.inner-header {
  height: 65vh;
  width: 100%;
  margin: 0;
  padding: 0;
}

.flex {
  /*Flexbox for containers*/
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.waves {
  position: relative;
  width: 100%;
  height: 15vh;
  margin-bottom: -7px;
  /*Fix for safari gap*/
  min-height: 100px;
  max-height: 150px;
}

.content {
  position: relative;
  height: 20vh;
  text-align: center;
  background-color: white;
}

/* Animation */

.parallax>use {
  animation: move-forever 25s cubic-bezier(.55, .5, .45, .5) infinite;
}

.parallax>use:nth-child(1) {
  animation-delay: -2s;
  animation-duration: 7s;
}

.parallax>use:nth-child(2) {
  animation-delay: -3s;
  animation-duration: 10s;
}

.parallax>use:nth-child(3) {
  animation-delay: -4s;
  animation-duration: 13s;
}

.parallax>use:nth-child(4) {
  animation-delay: -5s;
  animation-duration: 20s;
}

@keyframes move-forever {
  0% {
    transform: translate3d(-90px, 0, 0);
    margin-top: 0px;
  }

  25% {
    margin-top: 10px;
  }

  50% {
    margin-top: 20px;
  }

  75% {
    margin-top: 10px;
  }

  100% {
    transform: translate3d(85px, 0, 0);
    margin-top: 0px;
  }
}

/*Shrinking for mobile*/
@media (max-width: 768px) {
  .waves {
    height: 40px;
    min-height: 40px;
  }

  .content {
    height: 30vh;
  }

  h1 {
    font-size: 24px;
  }
}