W3School TIY Editor

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {font-family: Arial, Helvetica, sans-serif;}
* {box-sizing: border-box;}

/* 用于打开聊天表单的按钮 - 固定在页面底部 */
.open-button {
  background-color: #555;
  color: white;
  padding: 16px 20px;
  border: none;
  cursor: pointer;
  opacity: 0.8;
  position: fixed;
  bottom: 23px;
  right: 28px;
  width: 280px;
}

/* 弹出聊天窗口 - 默认隐藏 */
.chat-popup {
  display: none;
  position: fixed;
  bottom: 0;
  right: 15px;
  border: 3px solid #f1f1f1;
  z-index: 9;
}

/* 为表单容器添加样式 */
.form-container {
  max-width: 300px;
  padding: 10px;
  background-color: white;
}

/* 全宽文本区域 */
.form-container textarea {
  width: 100%;
  padding: 15px;
  margin: 5px 0 22px 0;
  border: none;
  background: #f1f1f1;
  resize: none;
  min-height: 200px;
}

/* 当文本区域获得焦点时，执行某些操作 */
.form-container textarea:focus {
  background-color: #ddd;
  outline: none;
}

/* 设置提交/发送按钮的样式 */
.form-container .btn {
  background-color: #04AA6D;
  color: white;
  padding: 16px 20px;
  border: none;
  cursor: pointer;
  width: 100%;
  margin-bottom: 10px;
  opacity: 0.8;
}

/* 为取消按钮添加红色背景颜色 */
.form-container .cancel {
  background-color: red;
}

/* 为按钮添加悬停效果 */
.form-container .btn:hover, .open-button:hover {
  opacity: 1;
}
</style>
</head>
<body>

<h1>弹出聊天窗口</h1>

<p>点击页面底部的按钮打开聊天表单。</p>

<p>注意按钮和表单是固定的 - 它们将始终位于浏览器窗口的底部。</p>

function closeForm() {
  document.getElementById("myForm").style.display = "none";
}
</script>

</body>
</html>