<div class="row" style="margin-top:30px;">
<div class="col-md-6" style="border-right:1px solid #ddd;">
<div class="well col-md-10">
<h3>用户登录</h3>
<div class="input-group input-group-md">
<span class="input-group-addon" id="sizing-addon1"><i class="glyphicon glyphicon-user" aria-hidden="true"></i></span>
<input type="text" class="form-control" placeholder="用户名" aria-describedby="sizing-addon1">
</div>
<div class="input-group input-group-md">
<span class="input-group-addon" id="sizing-addon1"><i class="glyphicon glyphicon-lock"></i></span>
<input type="password" class="form-control" placeholder="密码" aria-describedby="sizing-addon1">
</div>
<div class="well well-sm" style="text-align:center;">
<input type="radio" name="kind" value="tea"> 老师
<input type="radio" name="kind" value="stu"> 学生
</div>
<button type="submit" class="btn btn-success btn-block">
登录
</button>
</div>
</div>
<div class="col-md-6">
<h3>
欢迎使用学生作业管理系统
</h3>
<ul>
<li>学生使用<em>学号</em>登录，初始密码为<em>6个1</em>，登录后请及时修改密码</li>
<li>老师请使用<em>工号</em>登录，初始密码为<em>6个1</em>，登录后请及时修改密码</li>
</ul>
</div>
</div>

.input-group{
margin:10px 0px;//输入框上下外边距为10px,左右为0px
}
h3{
padding:5px;
border-bottom:1px solid #ddd;//h3字体下边框
}
li{
list-style-type:square;//列表项图标为小正方形
margin:10px 0;//上下外边距是10px
}
em{//强调的样式
color:#c7254e;
font-style: inherit;
background-color: #f9f2f4;
}