CSS登录表单样式设计教程

<form class="login-form">
  <h2>登录</h2>
  &lt;input type=&quot;text&quot; placeholder=&quot;用户名&quot; required&gt;
  &lt;input type=&quot;password&quot; placeholder=&quot;密码&quot; required&gt;
  <button type="submit">登录</button>
</form>

body {
  margin: 0;
  padding: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #f4f6f9;
}

.login-form {
  width: 320px;
  padding: 30px;
  background: white;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}
.login-form h2 {
  margin: 0 0 20px;
  text-align: center;
  color: #333;
  font-size: 24px;
}

.login-form input {
  width: 100%;
  padding: 12px;
  margin-bottom: 16px;
  border: 1px solid #ddd;
  border-radius: 5px;
  box-sizing: border-box;
  font-size: 14px;
}
.login-form input:focus {
  border-color: #4a90e2;
  outline: none;
  box-shadow: 0 0 5px rgba(74, 144, 226, 0.3);
}

.login-form button {
  width: 100%;
  padding: 12px;
  background-color: #4a90e2;
  color: white;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.3s;
}
.login-form button:hover {
  background-color: #3a7bc8;
}

@media (max-width: 480px) {
  .login-form {
    width: 90%;
    padding: 20px;
  }
}

.login-form .extra-links {
  text-align: right;
  font-size: 14px;
}
.login-form .extra-links a {
  color: #4a90e2;
  text-decoration: none;
}
.login-form .extra-links a:hover {
  text-decoration: underline;
}