JSFiddle - React, Tailwind, and code Playground

by Gonzalo Barba

HTML

<div id="SideNav">
     <div id="Headerhome" class="item menuSelected">
         <div id="Site-icon-1" class="Site-icon SiteIconHover"></div> 
         Dashboard
     </div>
     <div id="HeaderSites" class="item">
         <div id="Site-icon-2" class="Site-icon"></div>
         Clients
     </div>
     <div id="HeaderApps" class="item">
         <div id="Site-icon-3" class="Site-icon"></div>
         Apps
     </div>
</div>

CSS

.SiteIconHover {
    background-color: #00a9ff !important;
    width: 25px;
    height: 25px;
    float: left;
    margin-right: 15px;
    margin-top: 12px;
    margin-left: 5px;
}


.menuSelected {
    border-left: 3px solid #26b3f7;
    background: #18374f;
}

.Site-icon  {
    background-color:#000;
    width:25px;
    height:25px;
    float:left;
    margin-right:15px;
    margin-top:12px;
    margin-left:5px;
}

.item {
    background: #254661;
    font-weight: normal;
    color: #eeeeee;
    box-sizing: border-box;
    outline: 0;
    line-height:50px;
    text-decoration: none;
    font-size: 100%;
    list-style: none;
    width:240px;
    height:50px;
    display: block;
    cursor: pointer;
    margin-top: 2px;
    margin-left:-20px;
    margin-right:0px;
    padding-left:20px;
    font-family:'Segoe UI';
}

JavaScript

$(document).ready(function(){
    $('.item').on('click', function(){
        $('.item').removeClass('menuSelected');
        $('.item').children('div').removeClass('SiteIconHover');
        
        $(this).addClass('menuSelected');
        $(this).children('div').addClass('SiteIconHover');
    });
});