现在实现的效果是：

我想下面不要滚动条，红框内的完整的显示在弹出框的右边，这样怎么实现？

类似下面：

（这个是ps的）

下面是我的代码，需要做怎么样的修改，就可以实现上面的要求？谢谢！！

下面是代码：
html：

 
 
 
A组 
 
张三
 
李四
 
王五
 
 
 
B组
 
C组
 
D组
 
E组
 
D组
 
 

CSS代码：

.select-event{position:fixed;top:0;bottom:0;left:0;right:0;display: none;z-index: 10000} .select-event.in{display: block} .select-event .back{position: relative;height:100%;width:100%;background-color: #000;opacity: 0;z-index: 99999;-webkit-transition: opacity linear 300ms;transition: opacity linear 300ms;} .select-event.in .back{opacity: .5;} .select-event .con{position: absolute;top:50%;left:50%;width:200px;border-radius: 3px;margin-left: -110px;margin-top: -150px;max-height:430px;overflow-y:auto;padding:15px;z-index:100000;background-color: #fff;opacity: 0;-webkit-transition: opacity linear 300ms;transition: opacity linear 300ms;} .select-event.in .con{opacity: 1;} .select-event .con>li{padding: 10px;height:18px;border: 1px solid #ccc;margin-top: 3px;border-radius: 2px;position: relative;cursor: pointer;} .select-event .con>li:hover{border-color: #4DC476} .select-event .con>li.active{border-color: #4DC476} .select-event .con .mem-list{position: absolute;right:-101px;top:-1px;width:100px;padding-top:1px;z-index: 100001;background-color: #fff;border:1px solid #4DC476;display: none;} .select-event .con .mem-list.active{display: block;} /*.select-event .con .mem-list::before{content: "";display: block;position: absolute;left:-16px;top:2px;border: 8px solid transparent;border-right-color: #ccc;} .select-event .con .mem-list::after{content: "";display: block;position: absolute;left:-15px;top:2px;border: 8px solid transparent;border-right-color: #fff;} .select-event .con .mem-list:hover::before{border-right-color: #efefef;} .select-event .con .mem-list:hover::after{border-right-color: #efefef;}*/ .select-event .con .mem-list::before{content: "";display: inline-block;position:absolute;background-color: #fff;left:-1px;top:0;height: 38px;width:1px;} .select-event .con .mem-list .mem{padding: 10px;margin-top: -1px;} .select-event .con .mem-list .mem:hover{background-color: #efefef;} .select-event .con .group-box{position: absolute;top:10px;right:0;width:100px;height:200px;border:1px solid #4DC476;background-color: #fff;z-index: 10000;}