<form class="form-horizontal col-md-offset-4 col-md-4">
<label for="inputEmail3" class="col-sm-2 control-label">邮箱</label>
<input type="email" class="form-control" id="inputEmail3" placeholder="Email">
<label for="inputPassword3" class="col-sm-2 control-label">密码</label>
<input type="password" class="form-control" id="inputPassword3" placeholder="Password">
<label>
<input type="checkbox">记住密码
</label>
<button type="submit" class="btn btn-default login ">登录</button>
</form>