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The effect achieved now is:

I don’t want scroll bars below, and the entire red box is displayed on the right side of the pop-up box. How to achieve this?

Similar to the following:

(This is from PS)

The following is my code. What modifications need to be made to achieve the above requirements? Thanks! !

The following is the code:
html:

<p class="select-event in" id="selectEvent" style="display: block;">
    <p class="back" onclick="hideSelectEvent()"></p>
    <ul class="con" onclick="selectEvent(this)">
        <li value="A組" class="group">A組
            <ul class="mem-list active">
                <li class="mem">張三</li>
                <li class="mem">李四</li>
                <li class="mem">王五</li>
            </ul>
        </li>
        <li value="B組">B組</li>
        <li value="C組">C組</li>
        <li value="D組">D組</li>
        <li value="E組">E組</li>
        <li value="D組">D組</li>
    </ul>
</p>

CSS code:

.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;}