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HTML 

              
                <div class="container">
  <div class="content">
    <h1>Tilted angles in CSS</h1>
    <p>Thanks to Pythagoras Theorem, some gradients and a bit of Sass-powered trigonometry, we can easily created tilted angles with nothing but CSS.</p>
    <pre><code>.container {
  @include tilted(3deg, $color: #fff);
}</code></pre>
    <p>How handy!</p>
  </div>
</div>
!

CSS 

              
                /// Computes the height of the tilted pseudo-element based on the given angle
/// using Pythagoras Theorem.
// sin(..), pow(..) and sqrt(..)  functions come from this pen:
// https://codepen.io/HugoGiraudel/pen/rLpPGo
/// @access public
/// @author Hugo Giraudel
/// @param {Angle} $angle - the tilt angle
@function get-tilted-height($angle) {
  $a: (100% / 1%);
  $A: (90deg - $angle);
  $c: ($a / sin($A));
  $b: sqrt(pow($c, 2) - pow($a, 2));

  @return (abs($b) * 1%);
}

/// Apply a tilted effect by generating a pseudo-element with a diagonal
/// splitted background.
/// @access public
/// @author Hugo Giraudel
/// @param {Angle} $angle - the tilt angle
/// @param {Color} $color - the color to be used as background + gradient
/// @param {String} $position ['top'] - either `top` or `bottom`
/// @param {String} $pseudo ['before'] - either `before` or `after`
@mixin tilted($angle, $color, $position: 'top', $pseudo: 'before') {
  $height: get-tilted-height($angle);

  position: relative;
  background-color: $color;

  &::#{$pseudo} {
    content: '';
    padding-top: $height;
    position: absolute;
    left: 0;
    right: 0;

    @if ($position == 'top') {
      bottom: 100%;
      background-image: linear-gradient($angle, $color 50%, transparent 50%);
    } @else {
      top: 100%;
      background-image: linear-gradient($angle, transparent 50%, $color 50%);
    }
  }
}

/*
 * Demo styles
 */

html {
  box-sizing: border-box;
  height: 100%;
}

*, ::before, ::after {
  box-sizing: inherit;
}

body {
  background-color: rgb(223, 231, 238);
  line-height: 1.5;
  font-size: 125%;
  display: flex;
  align-items: flex-end;
  height: 100%;
}

.container {
  @include tilted(3deg, rgb(255, 255, 255));
  padding: 0 1em;
  max-width: 80%;
  margin: 0 auto;
  filter: drop-shadow(0 1em 1em rgba(0, 0, 0, 0.1));
}

.content {
  max-width: 600px;
  margin: 0 auto;
  padding: 0 1em;
}

h1 {
  border-bottom: 3px double deepskyblue;
  padding-bottom: 0.25em;
  margin-bottom: 0.25em;
}

pre {
  background-color: #efefef;
  border: 1px solid rgba(0, 0, 0, 0.1);
  padding: 0.5em;
}
!

JS
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