登录表单实战

HTML 结构

<form class="login-form">
  <h2>用户登录</h2>
  <div class="form-group">
    <label for="username">用户名</label>
    <input type="text" id="username" name="username">
  </div>
  <div class="form-group">
    <label for="password">密码</label>
    <input type="password" id="password" name="password">
  </div>
  <button type="submit">登录</button>
</form>

CSS 样式

.login-form {
  max-width: 400px;
  margin: 50px auto;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.form-group {
  margin-bottom: 20px;
}
.form-group input {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
}
button {
  width: 100%;
  padding: 12px;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
button:hover {
  background: #0056b3;
}

表单验证样式

input:valid { border-color: green; }
input:invalid { border-color: red; }

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