<form class="form-horizontal" role="form">
<div class="form-group">
<label for="inputEmail3" class="col-sm-2 control-label">邮箱</label>
<div class="col-sm-10">
<input type="email" class="form-control" >
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" class="btn btn-default">进入邮箱</button>
</div>
</div>
</form>