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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> * { box-sizing: border-box; } input[type=text], select, textarea { width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px; resize: vertical; } label { padding: 12px 12px 12px 0; display: inline-block; } input[type=submit] { background-color: #04AA6D; color: white; padding: 12px 20px; border: none; border-radius: 4px; cursor: pointer; float: right; } input[type=submit]:hover { background-color: #45a049; } .container { border-radius: 5px; background-color: #f2f2f2; padding: 20px; } .col-25 { float: left; width: 25%; margin-top: 6px; } .col-75 { float: left; width: 75%; margin-top: 6px; } /* 清除列后的浮动 */ .row:after { content: ""; display: table; clear: both; } /* 响应式布局 - 当屏幕宽度小于 600px 时，使两列堆叠，而不是并排 */ @media screen and (max-width: 600px) { .col-25, .col-75, input[type=submit] { width: 100%; margin-top: 0; } } </style> </head> <body> <h2>响应式表单</h2> <p>调整浏览器窗口大小以查看效果。当屏幕宽度小于 600 像素时，使两列上下堆叠而不是并排显示。</p> <div class="container"> <form action="/action_page.php"> <div class="row"> <div class="col-25"> <label for="fname">First Name</label> </div> <div class="col-75"> <input type="text" id="fname" name="firstname" placeholder="Your name.."> </div> </div> <div class="row"> <div class="col-25"> <label for="lname">Last Name</label> </div> <div class="col-75"> <input type="text" id="lname" name="lastname" placeholder="Your last name.."> </div> </div> <div class="row"> <div class="col-25"> <label for="country">Country</label> </div> <div class="col-75"> <select id="country" name="country"> <option value="australia">Australia</option> <option value="canada">Canada</option> <option value="usa">USA</option> </select> </div> </div> <div class="row"> <div class="col-25"> <label for="subject">Subject</label> </div> <div class="col-75"> <textarea id="subject" name="subject" placeholder="Write something.." style="height:200px"></textarea> </div> </div> <div class="row"> <input type="submit" value="Submit"> </div> </form> </div> </body> </html>