今天仿制了Twitter的登录表单，除了大背景是使用的img，其他都是纯CSS3代码实现。整个效果使用了Bootstrap的表单风格，并且运用box-sizing改变了元素默认的box module风格，同时使用了CSS3的gradient、box-shadow和text-shadow制作了其他效果。具体请查看相关代码。

demodownload

HTML 结构

<form class="form">
  <h1><span class="log-in">Log in</span> or <span class="sign-up">sign up</span></h1>
  <p class="float">
    <label for="login"><i class="icon-user"></i>Username</label>
    <input type="text" name="login" placeholder="Username or email">
  </p>
  <p class="float">
    <label for="password"><i class="icon-lock"></i>Password</label>
    <input type="password" name="password" placeholder="Password" class="showpassword">
  </p>
  <p class="opt">
    <input type="checkbox" class="showpasswordcheckbox" id="showPassword">
    <label for="showPassword">Show password</label>
  </p>
  <p class="clearfix">
    <a href="#" class="log-twitter">Log in with Twitter</a>    
    <input type="submit" name="submit" value="Log in">
  </p>
</form>​​

CSS 代码

*, ::after, ::before {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -ms-box-sizing: border-box;
  -o-box-sizing: border-box;
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
body {
  background: #E1C192 url(wood_pattern.jpg);
}
.form {
  width: 340px;
  margin: 60px auto 30px;
  padding: 15px;
  position: relative;
  background: #fffaf6;
  border-radius: 4px;
  color: #7e7975;
  box-shadow:0 2px 2px rgba(0,0,0,0.2),0 1px 5px rgba(0,0,0,0.2), 0 0 0 12px rgba(255,255,255,0.4); 
}

.form h1 {
  font-size: 15px;
  line-height:1;
  font-weight: bold;
  color: #bdb5aa;
  padding-bottom: 8px;
  border-bottom: 1px solid #EBE6E2;
  text-shadow: 0 2px 0 rgba(255,255,255,0.8);
  box-shadow: 0 1px 0 rgba(255,255,255,0.8);
}

.form h1 .log-in,
.form h1 .sign-up {
  display: inline-block;
  text-transform: uppercase;
}

.form h1 .log-in {
  color: #6c6763;
  padding-right: 2px;
}

.form h1 .sign-up {
  color: #ffb347;
  padding-left: 2px;
}

.form .float {
  width: 50%;
  float: left;
  padding-top: 15px;
  border-top: 1px solid rgba(255,255,255,1);
}

.form .float:first-of-type {
  padding-right: 5px;
}

.form .float:last-of-type {
  padding-left: 5px;
}

.form label {
  display: block;
  padding: 0 0 5px 2px;
  cursor: pointer;
  text-transform: uppercase;
  font-weight: 400;
  text-shadow: 0 1px 0 rgba(255,255,255,0.8);
  font-size: 11px;
}

.form label i {
  margin-right: 5px; /* Gap between icon and text */
  display: inline-block;
  width: 10px;
}

.form input[type=text],
.form input[type=password] {
  font: 400 13px 'Lato', Calibri, Arial, sans-serif;
  display: block;
  width: 100%;
  padding: 5px;
  margin-bottom: 5px;
  border: 3px solid #ebe6e2;
  border-radius: 5px;
  -webkit-transition: all 0.3s ease-out;
  -moz-transition: all 0.3s ease-out;
  -ms-transition: all 0.3s ease-out;
  -o-transition: all 0.3s ease-out;
  transition: all 0.3s ease-out;
}

.form input[type=text]:hover,
.form input[type=password]:hover {
  border-color: #CCC;
}

.form label:hover ~ input {
  border-color: #CCC;
}

.form input[type=text]:focus,
.form input[type=password]:focus {
  border-color: #BBB;
  outline: none; /* Remove Chrome's outline */
}

.form input[type=submit],
.form .log-twitter {
  width: 49%;
  height: 38px;
  float: left;
  position: relative;
  box-shadow: inset 0 1px rgba(255,255,255,0.3);
  border-radius: 3px;
  cursor: pointer;
  font:bold 14px/38px 'Lato', Calibri, Arial, sans-serif ;
  text-align: center;
}

.form input[type=submit] {
  margin-left: 1%;
  background: #fbd568; /* Fallback */
  background: -moz-linear-gradient(#fbd568, #ffb347);
  background: -ms-linear-gradient(#fbd568, #ffb347);
  background: -o-linear-gradient(#fbd568, #ffb347);
  background: -webkit-gradient(linear, 0 0, 0 100%, from(#fbd568), to(#ffb347));
  background: -webkit-linear-gradient(#fbd568, #ffb347);
  background: linear-gradient(#fbd568, #ffb347);
  border: 1px solid #f4ab4c;
  color: #996319;
  text-shadow: 0 1px rgba(255,255,255,0.3);
}

.form .log-twitter {
  margin-right: 1%;
  background: #34a5cf; /* Fallback */
  background: -moz-linear-gradient(#34a5cf, #2a8ac4);
  background: -ms-linear-gradient(#34a5cf, #2a8ac4);
  background: -o-linear-gradient(#34a5cf, #2a8ac4);
  background: -webkit-gradient(linear, 0 0, 0 100%, from(#34a5cf), to(#2a8ac4));
  background: -webkit-linear-gradient(#34a5cf, #2a8ac4);
  background: linear-gradient(#34a5cf, #2a8ac4);
  border: 1px solid #2b8bc7;
  color: #ffffff;
  text-shadow: 0 -1px rgba(0,0,0,0.3);
  text-decoration: none;
}

.form input[type=submit]:hover,
.form .log-twitter:hover {
  box-shadow:inset 0 1px rgba(255,255,255,0.3), inset 0 20px 40px rgba(255,255,255,0.15);
}

.form input[type=submit]:active,
.form .log-twitter:active{
  top: 1px;
}

/* Fallback fro broswers that don't support box shadows */
.no-boxshadow .form input[type=submit]:hover {
  background: #ffb347;
}

.no-boxshadow .form .log-twitter:hover {
  background: #2a8ac4;
}

.form p:last-of-type {
  clear: both;    
}

.form .opt {
  text-align: right;
  margin-right: 3px;
}

.form label[for=showPassword] {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 11px;
  font-weight: 400;
  text-transform: capitalize;
}

.form input[type=checkbox] {
  vertical-align: middle;
  margin: -1px 5px 0 1px;
}

注：效果中的icon是调用了bootstrap的icon制作：

<link rel="stylesheet" href="font-awesome.css" />

demodownload

如需转载，烦请注明出处：http://www.w3cplus.com/demo/twitter-login-or-signup-form-with-css3.html