向容器添加 45 度角

Question

我有一个容器元素，我想弄清楚是否可以将它塑造成具有两个 45 度角。像这样：

现在只是一个矩形:

<div id="home-img-text">
        <div id="home-img-text-container">
            <div id="home-img-text-description">WRECKING <br>& DEMOLITION <br> DONE RIGHT.</div>
        </div>
    </div>
#home-img-text-container {
    background: rgba(0,0,0,.8);
    padding: 30px 20px;
}
#home-img-text-description {
    color: #FFF;
    font-size: 2.5em;
    line-height: 1.4em;
}

我该怎么做？

更新：

.home-img-text {
    position: absolute;
    left: 10%;
    top: 25%;
}
#home-img-text-container1, #home-img-text-container2 {
    position: relative;
    margin-bottom: 20px;
    background: rgba(0,0,0,.8);
    opacity: 0;
    transition:1s; -webkit-transition:1s;
    overflow: hidden;
}
#home-img-text-container1.fadeDisplay {
    opacity: 1;
    transform: translateX(30px); -webkit-transform: translateX(30px);
}
#home-img-text-container2.fadeDisplay {
    opacity: 1;
    transform: translateX(30px); -webkit-transform: translateX(30px);
}

#home-img-text-description {
    position: relative;
    margin: 40px 0px;  
    padding: 30px 20px;
    color: #FFF;
    font-size: 2.5em;
    line-height: 1.4em;
}
#home-img-text-description2 {
    color: #FFF;
    font-size: 2em;
    line-height: 1.4em;
    padding: 30px 20px;
}
/*----Adding this ---*/

#home-img-text-description:before {
  position: absolute;
  content: '';
  height: 40px;
  width: 100%;
  left: 0px;
  background: inherit;
}

#home-img-text-description:before {
  top: -40px;
  transform: skewX(45deg);
  transform-origin: right bottom;
}

Answer 1

#home-img-text-container {
  background: rgba(0,0,0,.8);
  padding: 30px 20px;
  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;
}

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

Answer 2

您正在通过前后使用 css3 选择器来实现此目的。

<style type="text/css">
   #home-img-text-container {
      background: rgba(0,0,0,.8);
      padding: 30px 20px;
      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>
<div id="home-img-text">
    <div id="home-img-text-container">
       <div id="home-img-text-description">WRECKING <br>& DEMOLITION <br> DONE RIGHT.</div>
   </div>
</div>

Answer 3

使用两个向相反方向倾斜（45 度）的伪元素也是生成此形状的不错选择。使用此选项的优点是它 在右上角和右下角产生透明切割 与使用边框方法创建的形状不同.

我不会推荐 clip-path（有或没有 SVG）因为 lack of support in IE。

#home-img-text{
  overflow: hidden;
}  
#home-img-text-container {
  position: relative;
  background: rgba(0, 0, 0, .8);
  padding: 30px 20px;
  margin: 40px 0px;
}
#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;
}

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

这是一个在形状的所有边上都有边框的版本：

#home-img-text{
  border-left: 2px solid;
  overflow: hidden;
}  
#home-img-text-container {
  position: relative;
  padding: 30px 20px;
  margin: 40px 0px;
  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: 2px 3px 0px 0px;
  transform: skewX(45deg);
  transform-origin: right bottom;
}
#home-img-text-container:after {
  bottom: -40px; /* -(height + border-bottom) */
  border-width: 0px 3px 2px 0px;
  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;
}

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

如果您需要添加图像（作为背景或不作为背景），则需要额外的几个元素和具有固定高度的元素。但如前所述，即使需要额外的元素，这种方法也有其优势。

#home-img-text {
  position: relative;
  padding: 40px 0px; /* 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: 0px 20px; /* 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: 0px 0px, 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: 0px 0px,0px 0px;
  transform: skewX(-45deg);
  transform-origin: right bottom;
}
#home-img-bottom:before {
  bottom: 0px;
  background-position: 0px 0px, 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;
}

<div id="home-img-text">
  <div id="home-img-top"></div>
  <div id="home-img-text-container">
    <div id="home-img-text-description">WRECKING
      <br>& DEMOLITION
      <br>DONE RIGHT.</div>
  </div>
  <div id="home-img-bottom"></div>
</div>

Answer 4

你也可以在这里使用 gradients 结合 background-size 和 calc() :

只有边框：

#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 , 
    3px 100%, 
    3px calc(100% - 4.25em), 
    100% 50%, 
    100% 50%
    ;
    padding: 30px 20px;
}
#home-img-text-description {
    font-size: 2.5em;
    line-height: 1.4em;
}

html {
  min-height:100%;
  background:linear-gradient(to bottom right, tomato, gold);
  }

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

仅背景：（最接近问题）

#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: 30px 20px;
}
#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%);
  }

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

边框和背景：

#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 , 
    3px 100%, 
    3px calc(100% - 4.25em), 
    100% 50%, 100% 50%, 
    100% 50%, 100% 50%
    ;
      /* rgba(0,0,0,.8);*/
    padding: 30px 20px;
}
#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%);
  }

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

demo & codepen to play with

向容器添加 45 度角

Adding a 45 degree angle to a container

html

css

css-shapes