Create a slanted edge to a div [duplicate]

You can use a skewed pseudo element to make the slanted solid background of your element. This way, the text won’t be affected by the transform property.

The transform origin property allows the pseudo element to be skewed from the right bottom corner and the overflowwing parts are hidden with overflow:hidden;.

The pseudo element is stacked behind the content of the div with a negative z-index:

div {
  position: relative;
  display: inline-block;
  padding: 1em 5em 1em 1em;
  overflow: hidden;
  color: #fff;
}

div:after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #000;
  -webkit-transform-origin: 100% 0;
  -ms-transform-origin: 100% 0;
  transform-origin: 100% 0;
  -webkit-transform: skew(-45deg);
  -ms-transform: skew(-45deg);
  transform: skew(-45deg);
  z-index: -1;
}

body {
  background: url('https://farm3.staticflickr.com/2878/10944255073_973d2cd25c.jpg');
  background-size: cover;
}

<div>slanted div text</div>
<div>
  slanted div text<br/> on several lines<br/> an other line
</div>
<div>wider slanted div text with more text inside</div>