html - 如何使用 HTML、CSS 使背景 div 内部 flex ？

Question

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Answer 1

您可以像下面这样使用 linear-gradient 考虑多个背景，而不需要额外的元素:

.bg{
  width: 400px;
  height: 220px;
  padding: 50px 0;
  box-sizing:border-box;
  text-align: center;
  background:
    linear-gradient(to bottom left , red 50%,transparent 51%) bottom left,
    linear-gradient(to bottom left , transparent 49%,red 50%) top    left,
    linear-gradient(to bottom right, red 50%,transparent 51%) bottom right,
    linear-gradient(to bottom right, transparent 49%,red 50%) top    right,
    red content-box;
  background-size:50% 50px;
  background-repeat:no-repeat;
  color: #fff;
  display: flex;
}
.bg p{
  text-align: center;
  margin: auto;
  font-size: 36px;
}

<div class="bg">
  <p>Section Content</p>
</div>

但如果你需要边框，我会考虑这样的伪元素:

.bg{
  width: 400px;
  height: 200px;
  padding: 20px;
  text-align: center;
  position:relative;
  color: #fff;
  display: flex;
  z-index:0;
}
.bg:before,
.bg:after{
  content:"";
  position:absolute;
  top:0;
  bottom:0;
  background:red;
  border:2px solid #000;
  z-index:-1;
}
.bg:before {
  right:50%;
  left:0;
  transform:skewY(15deg);
  transform-origin:top left;
  border-right:none;
}
.bg:after {
  left:50%;
  right:0;
  transform:skewY(-15deg);
  transform-origin:top right;
  border-left:none;
}
.bg p{
  text-align: center;
  margin: auto;
  font-size: 36px;
}

<div class="bg">
  <p>Section Content</p>
</div>