文本居中和按钮右对齐

如何使文本显示在中心并且按钮显示在框的右侧，同时仍然能够很好地缩放屏幕？这意味着当屏幕缩小时，框和文本之间的空间会增加，而当屏幕放大时，空间会缩小。

这是我所拥有的...

https://imgur.com/a/MigatID

这是我想要得到的...

https://imgur.com/H2gCl0S

编辑：这是JSFiddle ...

https://jsfiddle.net/d697spr8/1/

<div id="outer">
    <div class="topStuff">
        <p>Games</p>
        <div class="dropdownListPg">
            <button class="dropbtn" style="height: 50px; width: 120px">Sort By
                <i class="fa fa-caret-down"></i>
            </button>
            <div class="dropdownListPg-content" style="color: black">
                <a href="index.html"><button style="height: 50px; width: 120px">Alphabetical</button></a>
                <a href="indexDate.html"><button style="height: 50px; width: 120px">Date</button></a>
                <a href="indexUserScore.html"><button style="height: 50px; width: 120px">User Score</button></a>
            </div>
        </div>
    </div>
</div>

#outer
{
    min-width: 1200px;
}

.topStuff
{
    display: flex;
    justify-content: center;

    margin: 0;
    margin-top: 20px;
    margin-left: 150px;
    margin-right: 150px;
    padding: 0;
    background-color: #999999;
}


.dropdownListPg
{
    display: inline;
}

.dropdownListPg .dropbtn
{

}

.dropdownListPg-content
{
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;

    width: fit-content;
    height: fit-content;
    overflow-x: hidden;

    margin: 0;
    padding: 0;
}

.dropdownListPg-content a
{
    float: none;
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;

    color: black !important;

    margin: 0;
    padding: 0;
}

.dropdownListPg-content a:hover
{
    background-color: wheat !important;
}

.dropdownListPg:hover .dropdownListPg-content
{
    display: block;
}