W3.CSS - 表单

W3.CSS 有一个非常漂亮且响应灵敏的 CSS，用于表单设计。使用以下 CSS -

先生。没有。 类名和描述
1

w3组

代表一个有边框的容器。可用于对标签和输入进行分组。
2

w3-输入

美化输入控件。
3

w3标签

美化标签。
4

w3-复选框 w3-复选标记

美化复选框/单选按钮。

例子

w3css_forms.htm

现场演示 
<html>
   <head>
      <title>The W3.CSS Forms</title>
      <meta name = "viewport" content = "width = device-width, initial-scale = 1">
      <link rel = "stylesheet" href = "https://www.w3schools.com/lib/w3.css">
   </head>
   
   <body>
      <form class = "w3-container w3-card-8">
         <div class = "w3-group">
            <input class = "w3-input" type = "text" style = "width:90%" required>
            <label class = "w3-label">User Name</label>
         </div>
         
         <div class = "w3-group">
            <input class = "w3-input" type = "text" style = "width:90%" required>
            <label class = "w3-label">Email</label>
         </div>
         
         <div class = "w3-group">
            <textarea class = "w3-input" style = "width:90%" required></textarea>
            <label class = "w3-label">Comments</label>
         </div>
         <div class = "w3-row">
            <div class = "w3-half">
               <label class = "w3-checkbox">
                  <input type = "checkbox" checked = "checked">
                  <div class = "w3-checkmark"></div> Married
               </label>
               <br>
               <label class = "w3-checkbox">
                  <input type = "checkbox">
                  <div class = "w3-checkmark"></div> Single
               </label>
               <br>
               <label class = "w3-checkbox">
                  <input type = "checkbox" disabled>
                  <div class = "w3-checkmark"></div> Don't know (Disabled)
               </label>
               <br>
               <br>
            </div>
            
            <div class = "w3-half">
               <label class = "w3-checkbox">
                  <input type = "radio" name = "gender" value = "male" checked>
                  <div class = "w3-checkmark"></div> Male
               </label>
               <br>
               <label class = "w3-checkbox">
                  <input type = "radio" name = "gender" value = "female">
                  <div class = "w3-checkmark"></div> Female
               </label>
               <br>
               <label class = "w3-checkbox">
                  <input type = "radio" name = "gender" value = "female" disabled>
                  <div class = "w3-checkmark"></div> Don't know (Disabled)
               </label>
            </div>
         </div>
      </form>
   </body>
</html>

结果

验证结果。