JSFiddle - React, Tailwind, and code Playground

HTML

<select id='RQBRAND' name='RQBRAND' multiple style='width:120px;'>
    <option value="1287" title="CHILI'S">CHILI'S</option>
    <option value="1288" title="CHILI'S DOMESTIC FRANCHISE">CHILI'S DOMESTIC FRANCHISE</option>
    <option value="1289" title="CHILI'S INTERNATIONAL">CHILI'S INTERNATIONAL</option>
    <option value="1290" title="CHILI'S INTERNATIONAL FRANCHISE">CHILI'S INTERNATIONAL FRANCHISE</option>
    <option value="1291" title="MAGGIANO'S">MAGGIANO'S</option>
    <option value="1292" title="MAGGIANO'S DOMESTIC FRANCHISE">MAGGIANO'S DOMESTIC FRANCHISE</option>
    <option value="1293" title="MAGGIANO'S INTERNATIONAL">MAGGIANO'S INTERNATIONAL</option>
    <option value="1294" title="MAGGIANO'S INTERNATIONAL FRANCHISE">MAGGIANO'S INTERNATIONAL FRANCHISE</option>
</select>
<br/>
<input type="button" id="previous" value="Press" onclick="runMe()" />

JavaScript

var runMe = function () {
    var select = document.getElementById('RQBRAND');
    select.disabled = "disabled";
    
    for(var i=0;i<select.options.length;i++)
    {
        if(select.options[i].selected)
        {
           // select.options[i].style.backgroundColor = "red";
           // select.options[i].style.color = "white";
        }
    }
    

}