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Adding A 45 Degree Angle To A Container

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I have a container element that I am trying to figure out if I can shape it to have two 45 degree angles. Like this: It is simply a rectangle now:

Solution 1:

Using two pseudo-elements that are skewed in opposite directions (by 45 deg) would also be a good option for producing this shape. The advantage of using this option is that it produces a transparent cut on the right-top and right-bottom unlike the shapes created using the border method.

I wouldn't recommend clip-path (with or without SVG) because of the lack of support in IE.

#home-img-text{
  overflow: hidden;
}  
#home-img-text-container {
  position: relative;
  background: rgba(0, 0, 0, .8);
  padding: 30px20px;
  margin: 40px0px;
}
#home-img-text-container:after,
#home-img-text-container:before {
  position: absolute;
  content: '';
  height: 40px;
  width: 100%;
  left: 0px;
  background: inherit;
}
#home-img-text-container:before {
  top: -40px;
  transform: skewX(45deg);
  transform-origin: right bottom;
}
#home-img-text-container:after {
  bottom: -40px;
  transform: skewX(-45deg);
  transform-origin: right top;
}
#home-img-text-description {
  color: #FFF;
  font-size: 2.5em;
  line-height: 1.4em;
}
body {
  background-image: radial-gradient(circle at center, chocolate, sandybrown);
  min-height: 100vh;
}
<divid="home-img-text"><divid="home-img-text-container"><divid="home-img-text-description">WRECKING
      <br>& DEMOLITION
      <br>DONE RIGHT.</div></div></div>

Here is a version with borders on all the sides of the shape:

#home-img-text{
  border-left: 2px solid;
  overflow: hidden;
}  
#home-img-text-container {
  position: relative;
  padding: 30px20px;
  margin: 40px0px;
  background: rgba(0, 0, 0, .8);
  border-right: 2px solid;
}
#home-img-text-container:after,
#home-img-text-container:before {
  position: absolute;
  content: '';
  height: 38px;
  width: 100%;
  left: 0px;
  background: inherit;
  border: 2px solid;
}
#home-img-text-container:before {
  top: -40px; /* -(height + border-top) */border-width: 2px3px0px0px;
  transform: skewX(45deg);
  transform-origin: right bottom;
}
#home-img-text-container:after {
  bottom: -40px; /* -(height + border-bottom) */border-width: 0px3px2px0px;
  transform: skewX(-45deg);
  transform-origin: right top;
}
#home-img-text-description {
  color: #FFF;
  font-size: 2.5em;
  line-height: 1.4em;
}

body {
  background-image: radial-gradient(circle at center, chocolate, sandybrown);
  min-height: 100vh;
}
<divid="home-img-text"><divid="home-img-text-container"><divid="home-img-text-description">WRECKING
      <br>& DEMOLITION
      <br>DONE RIGHT.</div></div></div>

If you need to add an image (either as background or not), it will need an extra couple of elements and the element to have a fixed height. but as mentioned earlier this approach has its advantages even if it needs extra elements.

#home-img-text {
  position: relative;
  padding: 40px0px; /* top/bottom padding equal to height of the two skewed elements, don't set left/right padding  */overflow: hidden;
}
#home-img-text-container {
  height: 170px; /* height of image - 2 * height of skewed element */padding: 0px20px; /* don't set any top/bottom padding */background: linear-gradient(rgba(0, 0, 0, .8), rgba(0, 0, 0, .8)),url(http://lorempixel.com/800/250/nature/1);
  background-position: 0px0px, 0px -40px; /* 0px 0px, 0px -(height of skewed element) */
}
#home-img-top,
#home-img-bottom {
  position: absolute;
  content: '';
  height: 40px;
  width: 100%;
  left: 0px;
  overflow: hidden;  
}
#home-img-top {
  top: 0px;
  transform: skewX(45deg);
  transform-origin: right bottom;
}
#home-img-bottom {
  bottom: 0px;
  transform: skewX(-45deg);
  transform-origin: right top;
}
#home-img-top:before,
#home-img-bottom:before {
  position: absolute;
  content: '';
  height: 100%;
  width: 100%;
  left: 0px;
  background: linear-gradient(rgba(0, 0, 0, .8), rgba(0, 0, 0, .8)), url(http://lorempixel.com/800/250/nature/1);
}
#home-img-top:before {
  top: 0px;
  background-position: 0px0px,0px0px;
  transform: skewX(-45deg);
  transform-origin: right bottom;
}
#home-img-bottom:before {
  bottom: 0px;
  background-position: 0px0px, 0px -210px; /* 0px -(height of image - height of skewed element) */transform: skewX(45deg);
  transform-origin: right top;
}
#home-img-text-description {
  color: #FFF;
  font-size: 2.5em;
  line-height: 1.4em;
}
body {
  background-image: radial-gradient(circle at center, chocolate, sandybrown);
  min-height: 100vh;
}
<divid="home-img-text"><divid="home-img-top"></div><divid="home-img-text-container"><divid="home-img-text-description">WRECKING
      <br>& DEMOLITION
      <br>DONE RIGHT.</div></div><divid="home-img-bottom"></div></div>

Solution 2: 

#home-img-text-container {
  background: rgba(0,0,0,.8);
  padding: 30px20px;
  position: relative;
}

#home-img-text-container:before,
#home-img-text-container:after {
  position: absolute;
  content: '';
  display: block;  
  right: -40px;
  border: 40px solid transparent;
  border-right: 40px solid transparent;  
}

#home-img-text-container:before {
  top: 0;
  border-top: 40px solid white;  
}

#home-img-text-container:after {
  bottom: 0;
  border-bottom: 40px solid white;
}

#home-img-text-description {
  color: #FFF;
  font-size: 2.5em;
  line-height: 1.4em;
}
<divid="home-img-text"><divid="home-img-text-container"><divid="home-img-text-description">WRECKING <br>& DEMOLITION <br> DONE RIGHT.</div></div></div>

Solution 3:

you can also use gradients here combined with background-size and calc() :

only borders:

#home-img-text-container {
  margin:1em;
  display:inline-block;
    background:
      linear-gradient(0deg, rgba(0,0,0,0.9), rgba(0,0,0,0.9)) top left no-repeat ,
      linear-gradient(0deg, rgba(0,0,0,0.9), rgba(0,0,0,0.9)) bottom left no-repeat ,
      linear-gradient(90deg, rgba(0,0,0,0.9), rgba(0,0,0,0.9)) top left no-repeat,
      linear-gradient(0deg, rgba(0,0,0,0.9), rgba(0,0,0,0.9)) center right no-repeat,
      linear-gradient(-45deg, transparent 1.5em, rgba(0,0,0,0.8) 1.5em, rgba(0,0,0,0.9) calc(1.5em + 3px), transparent  calc(1.5em + 3px)) bottom left no-repeat,
      linear-gradient(-135deg, transparent 1.5em, rgba(0,0,0,0.8) 1.5em, rgba(0,0,0,0.9) calc(1.5em + 3px), transparent  calc(1.5em + 3px)) top left no-repeat
      ;
  background-size: 
    calc(100% - 2.25em) 3px ,
    calc(100% - 2.25em)  3px , 
    3px100%, 
    3pxcalc(100% - 4.25em), 
    100%50%, 
    100%50%
    ;
    padding: 30px20px;
}
#home-img-text-description {
    font-size: 2.5em;
    line-height: 1.4em;
}

html {
  min-height:100%;
  background:linear-gradient(to bottom right, tomato, gold);
  }
<divid="home-img-text"><divid="home-img-text-container"><divid="home-img-text-description">WRECKING
      <br>& DEMOLITION
      <br>DONE RIGHT.</div></div></div>

only background: (closest to question)

#home-img-text-container {
  margin: 1em;
  display: inline-block;
  background: 
    linear-gradient(-45deg, transparent 1.5em, rgba(0, 0, 0, 0.8) 1.5em) bottom left no-repeat, 
    linear-gradient(-135deg, transparent 1.5em, rgba(0, 0, 0, 0.8) 1.5em) top left no-repeat;
  background-size: 100%50%;
  /* rgba(0,0,0,.8);*/padding: 30px20px;
}
#home-img-text-description {
  color: #FFF;
  font-size: 2.5em;
  line-height: 1.4em;
}


html {
  background:linear-gradient(to bottom right, tomato 30%, white 30%);
  }
<divid="home-img-text"><divid="home-img-text-container"><divid="home-img-text-description">WRECKING
      <br>& DEMOLITION
      <br>DONE RIGHT.</div></div></div>

border and background :

#home-img-text-container {
  margin:1em;
  display:inline-block;
    background:
      linear-gradient(0deg, rgba(0,0,0,0.9), rgba(0,0,0,0.9)) top left no-repeat ,
      linear-gradient(0deg, rgba(0,0,0,0.9), rgba(0,0,0,0.9)) bottom left no-repeat ,
      linear-gradient(90deg, rgba(0,0,0,0.9), rgba(0,0,0,0.9)) top left no-repeat,
      linear-gradient(0deg, rgba(0,0,0,0.9), rgba(0,0,0,0.9)) center right no-repeat,
      linear-gradient(-45deg, transparent 1.5em, rgba(0,0,0,0.8) 1.5em, rgba(0,0,0,0.9) calc(1.5em + 3px), transparent  calc(1.5em + 3px)) bottom left no-repeat,
      linear-gradient(-135deg, transparent 1.5em, rgba(0,0,0,0.8) 1.5em, rgba(0,0,0,0.9) calc(1.5em + 3px), transparent  calc(1.5em + 3px)) top left no-repeat,
      linear-gradient(-45deg, transparent 1.5em, rgba(0,0,0,0.8) 1.5em) bottom left no-repeat,
      linear-gradient(-135deg, transparent 1.5em, rgba(0,0,0,0.8) 1.5em) top left no-repeat;
  
  background-size: 
    calc(100% - 2.25em) 3px ,
    calc(100% - 2.25em)  3px , 
    3px100%, 
    3pxcalc(100% - 4.25em), 
    100%50%, 100%50%, 
    100%50%, 100%50%
    ;
      /* rgba(0,0,0,.8);*/padding: 30px20px;
}
#home-img-text-description {
    color: #FFF;
    font-size: 2.5em;
    line-height: 1.4em;
}


html {
  background:linear-gradient(to bottom right, tomato 25%, gold 25%);
  }
<divid="home-img-text"><divid="home-img-text-container"><divid="home-img-text-description">WRECKING
      <br>& DEMOLITION
      <br>DONE RIGHT.</div></div></div>

demo & codepen to play with

Solution 4:

You are achieve this using css3 selector before and after.

<styletype="text/css">#home-img-text-container {
      background: rgba(0,0,0,.8);
      padding: 30px20px;
      width: 300px;
      position: relative;
   }
   #home-img-text-container:before{
     content: "";
     position: absolute;
     top: 0;
     right: 0;
     border-bottom: 45px solid rgba(0,0,0,0);
     border-right: 45px solid #fff;
     width: 45px;
     height: 0;
  }
  #home-img-text-container:after{
     content: "";
     position: absolute;
     bottom: 0;
     right: 0;
     border-top: 45px solid rgba(0,0,0,0);
     border-right: 45px solid #fff;
     width: 45px;
     height: 0;
  }
  #home-img-text-description {
     color: #FFF;
     font-size: 2.5em;
     line-height: 1.4em;
  }

</style><divid="home-img-text"><divid="home-img-text-container"><divid="home-img-text-description">WRECKING <br>& DEMOLITION <br> DONE RIGHT.</div></div></div>

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