三角形颠倒与圆角

Question

我需要在我网站的标题中重新创建这样的效果。 我想通过CSS做到这一点，任何人都可以帮助我，因为我被困在那个三角形......

这是我的测试：

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#main-nav {height:200px;width:1200px;background-color:#000}
#triangle {
    width: 0;
    height: 0px;
    border-style: solid;
    border-width: 300px 300px 0px 0px;
    border-color: #007bff transparent transparent transparent;
    border-radius: 70px 2px 2px 2px;
    margin: auto;
    top: -400px;
    position: relative;
    /* background-color: #ccc; */
    -moz-border-radius: 20px;
    transform: rotate(-135deg);
    /* border-top: 80px solid blue; */
    /* border-bottom: 80px solid blue; */
    /* border-right:80px solid blue; */
}

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<div id="main-nav">
</div>
<div id="triangle">
</div>

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Answer 1

你可以这样做：

<强> CSS

#main-nav {
  position: relative;
  height: 200px;
  width: 1200px;
  overflow: hidden;
  background-color: #D1C5B9;
  z-index: 1;
}

#triangle {
  position: absolute;
  display: block;
  width: 100%;
  background: #3C3C3A;
  height: 40px;
  z-index: 4;
}

#triangle:after {
  position: absolute;
  content: "";
  display: block;
  width: 100px;
  height: 50px;
  transform: rotate(15deg);
  background: #3C3C3A;
  z-index: 4;
  border-radius: 14px;
  left: 50%;
  margin-left: -65px;
  top: 0px;
  border: 1px solid #3C3C3A;
}

#triangle:before {
  position: absolute;
  content: "";
  display: block;
  width: 100px;
  height: 50px;
  transform: rotate(-15deg);
  background: #3C3C3A;
  z-index: 3;
  border-radius: 14px;
  left: 50%;
  margin-right: 0;
  top: 0px;
  border: 1px solid #3C3C3A;
}

<强> HTML

<div id="main-nav">
  <div id="triangle">
  </div>
</div>

注意：根据需要进行调整

<强> DEMO HERE