HTML可折叠按钮-如何将按钮高亮显示为href (多个按钮)？

<button class="collapsible">按钮</button>
<div class="content">
  <p>这是要隐藏或显示的内容。</p>
</div>

.collapsible {
  background-color: #f1f1f1;
  color: #000;
  cursor: pointer;
  padding: 10px;
  width: 100%;
  text-align: left;
  border: none;
  outline: none;
  transition: background-color 0.3s;
}

.collapsible:hover {
  background-color: #ddd;
}

.collapsible:after {
  content: '\002B';
  float: right;
  margin-left: 5px;
}

.active:after {
  content: "\2212";
}

.content {
  padding: 0 18px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

var coll = document.getElementsByClassName("collapsible");
var i;

for (i = 0; i < coll.length; i++) {
  coll[i].addEventListener("click", function() {
    this.classList.toggle("active");
    var content = this.nextElementSibling;
    if (content.style.maxHeight){
      content.style.maxHeight = null;
    } else {
      content.style.maxHeight = content.scrollHeight + "px";
    } 
  });
}