在 CSS 中为顶部和底部边框创建波浪形边框

Question

我正在尝试创建波浪形的顶部和底部边框，就像这里的图片一样

我尝试使用以下代码重新创建相同的效果

.wave{
  background: white;
  height: 25px;
  position: relative;  
}
.wave::before, .wave::after{
  border-bottom: 5px solid rgba(237, 30, 30, 1);
}
.wave::before{
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 12px;
  background-size: 20px 40px;
  background-image:
    radial-gradient(circle at 10px -15px, transparent 20px, rgba(237, 30, 30, 1) 21px);
}
.wave::after{
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 18px;
  background-size: 40px 40px;
  background-image:
    radial-gradient(circle at 10px 26px, rgba(237, 30, 30, 1) 20px, transparent 21px);
}


.wavebottom{
  background: rgba(237, 30, 30, 1);
  height: 25px;
  position: relative;  
}
.wavebottom::before, .wave::after{
  border-bottom: 5px solid rgba(237, 30, 30, 1);
}
.wave::before{
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 12px;
  background-size: 20px 40px;
  background-image:
    radial-gradient(circle at 10px -15px, transparent 20px, white 21px);
}
.wavebottom::after{
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 18px;
  background-size: 40px 40px;
  background-image:
    radial-gradient(circle at 10px 26px, white 20px, transparent 21px);
}

我在 3 div 秒内获得代码.. 首先 div 有波 class

第二个div有背景颜色和内容

第三个div有波底class

但我得到的波浪结果看起来像那样

我正在处理宽度为 1920 像素的页面，我不确定如何才能使它看起来与第一张图片一样

Answer 1

试试这个：

.wave-top {
  position: relative;
  margin-top: 20px;
}

.wave-top::before,
.wave-top::after {
  border-bottom: 5px solid rgba(237, 30, 30, 1);
}

.wave-top::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 10px;
  background-size: 20px 40px;
  background-image: radial-gradient(circle at 10px -15px, transparent 20px, rgba(237, 30, 30, 1) 21px);
}

.wave-top::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 15px;
  background-size: 40px 40px;
  background-image: radial-gradient(circle at 10px 26px, rgba(237, 30, 30, 1) 20px, transparent 21px);
}

.wave-mid {
  background-color: rgba(237, 30, 30, 1);
  height: 50px;
}

.wave-bottom {
  position: relative;
}

.wave-bottom::before,
.wave-bottom::after {
  border-top: 5px solid rgba(237, 30, 30, 1);
}

.wave-bottom::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 10px;
  background-size: 20px 40px;
  background-image: radial-gradient(circle at 10px -15px, transparent 20px, #fff 21px);
}

.wave-bottom::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 15px;
  background-size: 40px 40px;
  background-image: radial-gradient(circle at 10px 26px, #fff 20px, transparent 21px);
}

<div class='wave-top'></div>
<div class="wave-mid"></div>
<div class="wave-bottom"></div>

您可以根据需要增加 middle-div 的高度。这里我留着了50px

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