html如何实现这个边框样式，边框中间显示文字

Question

Answer 1

html

<div class="item">
  <h3> 这里显示文字</h3>
</div>

css

 *{box-sizing: border-box; padding: 0;margin: 0;}
body{
  padding: 50px
}
.item{
  width: 500px;
  height: 200px;
  margin: 0 auto;
  padding: 15px;
  border:2px solid rgba(63,174,174,1);
  border-radius: 20px;
  position: relative;
  h3{
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: #fff;
    padding: 0 50px;
    z-index: 2;;
  }
  &:before,&:after{
    content: '';
    position: absolute;
    top: -7px;
    width: 12px;
    height: 12px;
    border-radius: 6px;
    background-color: rgba(63,174,174,1);
    z-index: 3;
  }
  &:before{
    left: 135px;
  }
  &:after{
    right: 135px
  }
}

Answer 2

  <fieldset>
    <legend>这里显示文字</legend>
    这里显示内容
  </fieldset>

fieldset{
  width: 500px;
  min-height: 200px;
  border-radius: 10px;
  border: 2px solid #4fbaba;
}
legend{
  position: relative;
  text-align: center;
  padding: 0 50px;
}
legend:before, legend:after{
  content: '';
  display: table;
  position: absolute;  
  top: 0;
  width: 20px;
  height: 20px;
  border-radius: 10px;
  background: #4fbaba;
}
legend:before{
  left: 0;
}

legend:after{
  right: 0;
}

codepen地址

Answer 3

<div class="container">
      <div class="blueBorder">
         <div class="blueRadius">

         </div>
          <div class="blueRadius">
           
         </div>
         <div class="text">
           这里显示文字
         </div>
      </div>
    </div>

.container{
  width: 100%;
  height: 100%;
  display: flex;
  justify-content:center;
  background-color: #ffffff;
}
.blueBorder{
  width: 400px;
  height: 150px;
  border:2px solid rgba(63,174,174,1);
  border-radius: 20px;
  position: relative;
}
.blueBorder div{
  position: absolute;
}
.blueRadius{
  width: 12px;
  height: 12px;
  border-radius: 6px;
  background-color: rgba(63,174,174,1);
}
.blueRadius:first-child{
  top: -6px;
  left: 50px;
}
.blueRadius:nth-child(2){
  top: -6px;
  right: 50px;
}
.text{
  width: 272px;
  top: -10px;
  left: 62px;
  height: auto;
  text-align: center;
  background-color: #ffffff
}

Answer 4

要简单粗暴的话做个背景图就行了，要项目需要考虑性能优化在意那么几十几百毫秒的加载时间的话就按其他回答那样用css写吧。

Answer 5

链接描述