如何在悬停时更改模式弹出窗口的字体大小

<div class="hover-container">
  <div class="hover-trigger" onmouseover="showPopup()">悬停此处</div>
  <div class="popup" id="popup">弹出窗口内容</div>
</div>

.hover-container {
  position: relative;
}

.hover-trigger {
  display: inline-block;
  padding: 10px;
  background-color: #ccc;
}

.popup {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  padding: 10px;
  background-color: #fff;
  border: 1px solid #ccc;
}

.hover-trigger:hover + .popup {
  display: block;
  font-size: 16px; /* 设置悬停时的字体大小 */
}

function showPopup() {
  var popup = document.getElementById("popup");
  popup.style.display = "block";
}