JSFiddle - React, Tailwind, and code Playground

HTML

<fieldset style="position: relative">

                            <legend>The legend is legendary</legend>

                            <table>

                                <tr>

                                    <td>this a table - there are a lot of fields in here</td>

                                </tr>

                                <tr>

                                    <td>each row is different enough that trying to use divs would have been a freakin' nightmare</td>

                                </tr>

                                <tr>

                                    <td>The save button below is what I want to always be in the bottom right of the fieldset</td>

                                </tr>

                            </table>
<div class="lower-Right-Button">
                            <input type="submit" class="button" value="Save">
                            <input type="submit" class="button" value="New" style="margin-right: 10px">
                            </div>

                        </fieldset>

CSS

body 
{
    color: #333;
    font-size: .85em;
    font-family: "Segoe UI", Verdana, Helvetica, Sans-Serif;
    vertical-align: baseline;
}
#container{
    width: 100%;
    padding: 0;
}
#centerstripe{
    width: 960px;
    height: 100%;
    margin: auto;
    background-color: #e2e2e2;
}
#header{
    width: 960px;
    height: 180px;
    margin: auto;
}
#headerlogo{
    width: 150px;
    margin: auto;
    float: left;
}
#headermenu{
    width: auto;
    height: 170px;
    display: table-cell;
    vertical-align: bottom;
}
#content{
    width: 960px;
    min-height: 500px;
    margin: auto;
}
#leftmenu{
    width: 150px;
    float: left;
    padding-left: 7px;
    padding-top: 5px;
    min-height: 498px;
}
#maincontent{
    width: auto;
    min-height: 500px;
}
#footer{
    clear: both;
    font-size: .8em;
    width: 960px;
    text-align: right;
    margin: auto;
    height: 500px;
}
.inlinemenu{
    float: left;
    margin-left: 10px;
}
fieldset{
    min-height: 500px;
}
fieldset legend{
    font-weight: bold;
}
ul{
    padding-left: 0;
}
    
    
    
.lower-Right-Button{
    position: absolute;
    bottom: 0;
    right: 0;
}

.button {
    min-width: 100px;
}