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CSS Base

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              <body>
  <div class="svg-container">
    <!-- I crated SVG with: https://codepen.io/anthonydugois/pen/mewdyZ -->
    <svg viewbox="0 0 800 400" class="svg">
      <path id="curve" fill="#50c6d8" d="M 800 300 Q 400 350 0 300 L 0 0 L 800 0 L 800 300 Z">
      </path>
    </svg>
  </div>

  <header>
    <h1>This is a header title</h1>
    <h3>Here you are, scroll down.</h3>
  </header>

  <main>
    <p>And the main section.</p>
  </main>

  <footer>
    <p>And, the footer.</p>
    <small>🕷 Wish you luck, <a href="http://armantaherian.com">Arman</a>.</small>
  </footer>
</body>
            
          
!
            
              @import 'https://fonts.googleapis.com/css?family=Ubuntu:300, 400, 500, 700';

*, *:after, *:before {
  margin: 0;
  padding: 0;
}

.svg-container {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  z-index: -1;
}

svg {
  path {
    transition: .1s;
  }

  &:hover path {
    d: path("M 800 300 Q 400 250 0 300 L 0 0 L 800 0 L 800 300 Z");
  }
}

body {
  background: #fff;
  color: #333;
  font-family: 'Ubuntu', sans-serif;
  position: relative;
}

h3 {
  font-weight: 400;
}

header {
  color: #fff;
  padding-top: 10vw;
  padding-bottom: 30vw;
  text-align: center;
}

main {
  background: linear-gradient(to bottom, #ffffff 0%, #dddee1 100%);
  border-bottom: 1px solid rgba(0, 0, 0, .2);
  padding: 10vh 0 80vh;
  position: relative;
  text-align: center;
  overflow: hidden;

  &::after {
    border-right: 2px dashed #eee;
    content: '';
    position: absolute;
    top: calc(10vh + 1.618em);
    bottom: 0;
    left: 50%;
    width: 2px;
    height: 100%;
  }
}

footer {
  background: #dddee1;
  padding: 5vh 0;
  text-align: center;
  position: relative;
}

small {
  opacity: .5;
  font-weight: 300;

  a {
    color: inherit;
  }
}

            
          
!
            
              (function() {
  // Variables
  var $curve = document.getElementById("curve");
  var last_known_scroll_position = 0;
  var defaultCurveValue = 350;
  var curveRate = 3;
  var ticking = false;
  var curveValue;

  // Handle the functionality
  function scrollEvent(scrollPos) {
    if (scrollPos >= 0 && scrollPos < defaultCurveValue) {
      curveValue = defaultCurveValue - parseFloat(scrollPos / curveRate);
      $curve.setAttribute(
        "d",
        "M 800 300 Q 400 " + curveValue + " 0 300 L 0 0 L 800 0 L 800 300 Z"
      );
    }
  }

  // Scroll Listener
  // https://developer.mozilla.org/en-US/docs/Web/Events/scroll
  window.addEventListener("scroll", function(e) {
    last_known_scroll_position = window.scrollY;

    if (!ticking) {
      window.requestAnimationFrame(function() {
        scrollEvent(last_known_scroll_position);
        ticking = false;
      });
    }

    ticking = true;
  });
})();

            
          
!
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