JSFiddle - React, Tailwind, and code Playground

HTML

<section class="container">
    <div>
        <select id="values" size="4" multiple>
            <option>1</option>
            <option>2</option>
            <option>3</option>
        </select>
        <div>
            <input type="text" id="txtRight" />
        </div>
    </div>
</section>

CSS

SELECT, INPUT[type="text"] {
    width: 160px;
    box-sizing: border-box;
}
SECTION {
    padding: 8px;
    background-color: #f0f0f0;
    overflow: auto;
}
SECTION > DIV {
    float: left;
    padding: 4px;
}
SECTION > DIV + DIV {
    width: 40px;
    text-align: center;
}

JavaScript

$("#values").change(function () {
    var selectedItem = $("#values option:selected");
    $("#txtRight").val(selectedItem.text());
});