JSFiddle - React, Tailwind, and code Playground

HTML

<div class="toolsIndexSelectContainer">
    <select id="Clients" class="toolsIndexSelect disableElement">
        <option>Item</option>
        <option>Item 2</option>
        <option>Item 3</option>
    </select>
</div>

CSS

.toolsIndexSelectContainer {
    background-color:pink;
    width:170px;
}
.iamfocused{background-color:red}

JavaScript

$(".toolsIndexSelectContainer").click(function () {
    $(this).find("#Clients").focus();
});
$("#Clients").focus(function(){
    this.size=$(this).find('option').length;
}).blur(function(){
    this.size=1;
});