Mastering the 'wing' corner effect using only CSS

Is there a way to achieve the corner effect shown in this image (top corners)? I'm not familiar with the name of this effect. If it is possible, how would you go about implementing it?

Update: Some have suggested that this question is a duplicate. However, the solution provided for the duplicate does not take into account the fact that the 'wings' are filled with color. While the solution works well for a tab with an outline, this specific design includes a filled area.

What is the name of this technique?

https://i.sstatic.net/BveME.png

csscss-shapesrounded-corners

Answer №1

To achieve this effect, I recommend utilizing the :before and :after pseudoclasses to insert and position the corner tips. 

.box {
  position: absolute;
  background: gray;
  width: 400px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 0 0 10px 10px;
}

em {
  display: block;
  font-style: italic;
  font-size: 1.1em;
  color: white;
  text-align: center;
  margin: 0 auto;
  width: 100%;
  line-height: 2.2em;
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.6);
}

.box:before,
.box:after {
  content: '';
  display: block;
  border: 10px solid transparent;
  border-top: 10px solid gray;  
  position: absolute;
  top: 0;
}

.box:before {
  left: -6px;
}

.box:after {
  right: -6px;
}
<div class="box">
  <em>Benefits Included In Members Savings Package</em>  
</div>

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