纯CSS实现超过固定高度后出现展开折叠按钮

.content{
  width: 400px;
  max-height: 200px;
  overflow: hidden;
  border-radius: 4px;
  outline: 2px dashed royalblue;
}
.section{
  display: flex;
}
pre{
  white-space: pre-wrap;
}
.content::before{
  content: '';
  width: 100px;
  height: 100%;
  float: left;
}
.btn{
  float: right;
  width: 100px;
  text-align: center;
  position: relative;
  left: calc(50% - 50px);
  transform: translateY(-100%);
  cursor: pointer;
}
.btn::after{
  content: '';
  display: block;
  height: 34px;
  background-color: #666;
  transition: .2s background-color;
  -webkit-mask: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 320 512'>  </svg>") center/ 24px 24px no-repeat;
}
.btn:hover::after{
  background-color: royalblue;
}
.btn::before{
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 34px;
}
.text{
  box-sizing: border-box;
  width: 100%;
  padding: 10px 15px;
  float: right;
  line-height: 1.5;
  margin: 0;
  margin-left: -100px;
  font-size: 18px;
  color: #232323;
}
.content-check:checked+.content{
  max-height: fit-content;
}
.content-check:checked+.content .btn{
  left: auto;
  right: calc(50% - 50px);
}
.content-check:checked+.content .btn::after{
  transform: scaleY(-1);
}
.text{
     /* */
  -webkit-mask: linear-gradient(red 150px, transparent 200px);
}