rsmp。如何创建自定义大小的折叠？

<button class="accordion">折叠标题</button>
<div class="panel">
  <p>折叠内容</p>
</div>

.accordion {
  background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
  transition: 0.4s;
}

.active,
.accordion:hover {
  background-color: #ccc;
}

.panel {
  padding: 0 18px;
  background-color: white;
  display: none;
  overflow: hidden;
}

var accordions = document.getElementsByClassName("accordion");

for (var i = 0; i < accordions.length; i++) {
  accordions[i].addEventListener("click", function() {
    this.classList.toggle("active");
    var panel = this.nextElementSibling;
    if (panel.style.display === "block") {
      panel.style.display = "none";
    } else {
      panel.style.display = "block";
    }
  });
}