This Joomla 4 override allows you to display a list of articles in a Gmail box style simply using the Joomla's mod_articles_category module. At the bottom of this article, you can download the files of the override.

Joomla 4 frontend rendering

PhP markup

<?php
/**
 * @package     Joomla.Site
 * @subpackage  mod_articles_category
 * @author 	    web-eau.net
 * @copyright   (C) 2010 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

use Joomla\CMS\Helper\ModuleHelper;
use Joomla\CMS\Language\Text;
use Joomla\CMS\HTML\HTMLHelper;
use Joomla\CMS\Layout\LayoutHelper;

if (!$list)
{
	return;
}

?>
<ul class="mod-articlescategory category-module mod-list">
	<?php $items = $list; ?>
	<div class="containe">
		<div class="mail-box">
		<aside class="sm-side">
			<div class="inbox-body">
				<a href="#" title="Compose" class="btn btn-compose"> Compose </a>
			</div>
          
			<ul class="inbox-nav inbox-divider">
              
				<li class="active">
                  <a href="#"><i class="fas fa-inbox"></i> Inbox </a>                 
				</li>
				<li>
					<a href="#"><i class="far fa-envelope"></i> Sent Mail</a>
				</li>
				<li>
					<a href="#"><i class="far fa-bookmark"></i> Important</a>
				</li>
				<li>
					<a href="#"><i class="fas fa-external-link-alt"></i> Drafts</a>
				</li>
				<li>
					<a href="#"><i class="fas fa-trash"></i> Trash</a>
				</li>
			</ul>          
			
			<ul class="nav flex-column nav-stacked labels-info inbox-divider pb-2">
              	<li class="nav-item ps-2"> <h4>Labels</h4> </li>
				<li class="nav-item ps-4"> <a href="#"> <i class="fas fa-caret-square-right text-danger"></i> Work </a> </li>
				<li class="nav-item ps-4"> <a href="#"> <i class="fas fa-caret-square-right text-success"></i> Design </a></li>
				<li class="nav-item ps-4"> <a href="#"> <i class="fas fa-caret-square-right text-info"></i> Family </a></li>
				<li class="nav-item ps-4"> <a href="#"> <i class="fas fa-caret-square-right text-warning"></i> Friends </a></li>
				<li class="nav-item ps-4"> <a href="#"> <i class="fas fa-caret-square-right text-primary"></i> Office </a></li>
			</ul>
			
			<div class="inbox-body text-center">
				<div class="btn-group">
					<a class="btn mini btn-primary" href="#">
						<i class="fas fa-plus"></i>
					</a>
				</div>
				<div class="btn-group">
					<a class="btn mini btn-success" href="#">
						<i class="fas fa-phone"></i>
					</a>
				</div>
				<div class="btn-group">
					<a class="btn mini btn-info" href="#">
						<i class="fas fa-cog"></i>
					</a>
				</div>
			</div>
			
		</aside>
		<aside class="lg-side">
			<div class="inbox-body">
				<div class="mail-option">                  
					<div class="chk-all">						
						<input type="checkbox" class="mail-checkbox mail-group-checkbox me-2">	
                        All <i class="fas fa-angle-down"></i>
					</div>
					
					<div class="chk-all">
						<i class="fas fa-redo"></i>
					</div>
					
					<div class="chk-all hidden-phone">
						More <i class="fas fa-angle-down"></i>
					</div>
					
					<div class="chk-all">
						Move to <i class="fas fa-angle-down"></i>
					</div>
					
					<ul class="unstyled inbox-pagination">
						<li><span>1-50 of 234</span></li>
						<li>
							<a class="np-btn" href="#"><i class="fas fa-angle-left pagination-left"></i></a>
						</li>
						<li>
							<a class="np-btn" href="#"><i class="fas fa-angle-right pagination-right"></i></a>
						</li>
					</ul>
				</div>
				
				<table class="table table-inbox table-hover">
					<tbody>		
						
						<?php foreach ($items as $item) : ?>
					
						<?php if ($item->featured == 1) : ?>
						<tr class="unread">
						<?php else : ?>	
						<tr class="">
						<?php endif; ?>
						
							<td class="inbox-small-cells">
								<input type="checkbox" class="mail-checkbox">
							</td>
							<td class="inbox-small-cells"><i class="far fa-star"></i></td>
							
                          	<td class="view-message dont-show"><?php echo $item->displayAuthorName; ?></td><!-- Author --> 							
							
							<td class="view-message"><!-- Article title -->
							<?php if ($params->get('link_titles') == 1) : ?>
								<?php $attributes = ['class' => 'mod-articles-category-title ' . $item->active]; ?>
								<?php $link = htmlspecialchars($item->link, ENT_COMPAT, 'UTF-8', false); ?>
								<?php $title = htmlspecialchars($item->title, ENT_COMPAT, 'UTF-8', false); ?>
								<?php echo HTMLHelper::_('link', $link, $title, $attributes); ?>
							<?php else : ?>
								<?php echo $item->title; ?>
							<?php endif; ?>
							</td> 
                          
							<?php $item->urls = new JRegistry($item->urls); ?>
							<td class="view-message inbox-small-cells"><i class="fas fa-<?php echo $item->urls->get('urlatext'); ?>"></i></td> <!-- paperclip -->
							
							<td class="view-message text-end"><?php echo $item->displayDate; ?></td> <!-- date created format "F j"-->
						</tr>
						
						<?php endforeach; ?>
					</tbody>
				</table>
			</div>
		</aside>
		</div>
	</div>
</ul>

CSS

.mail-box {
    border-collapse: collapse;
    border-spacing: 0;
    display: table;
    table-layout: fixed;
    width: 100%;
}
.mail-box aside {
    display: table-cell;
    float: none;
    height: 100%;
    padding: 0;
    vertical-align: top;
}
.mail-box .sm-side {
    background: none repeat scroll 0 0 #e5e8ef;
    border-radius: 4px 0 0 4px;
    width: 20%;
}
.mail-box .lg-side {
    background: none repeat scroll 0 0 #fff;
    border-radius: 0 4px 4px 0;
    width: 80%;
}
.mail-box .sm-side .user-head {
    background: none repeat scroll 0 0 #00a8b3;
    border-radius: 4px 0 0;
    color: #fff;
    min-height: 80px;
    padding: 10px;
}
.user-head .inbox-avatar {
    float: left;
    width: 65px;
}
.user-head .inbox-avatar img {
    border-radius: 4px;
}
.user-head .user-name {
    display: inline-block;
    margin: 0 0 0 10px;
}
.user-head .user-name h5 {
    font-size: 14px;
    font-weight: 300;
    margin-bottom: 0;
    margin-top: 15px;
}
.user-head .user-name h5 a {
    color: #fff;
}
.user-head .user-name span a {
    color: #87e2e7;
    font-size: 12px;
}
a.mail-dropdown {
    background: none repeat scroll 0 0 #80d3d9;
    border-radius: 2px;
    color: #01a7b3;
    font-size: 10px;
    margin-top: 20px;
    padding: 3px 5px;
}
.inbox-body {
    padding: 20px;
}
.btn-compose {
    background: none repeat scroll 0 0 #ff6c60 !important;
    color: #fff !important;
    padding: 12px 0;
    text-align: center;
    width: 100%;
}
.btn-compose:hover {
    background: none repeat scroll 0 0 #f5675c;
    color: #000 !important;
}
ul.inbox-nav {
    display: inline-block;
    margin: 0;
    padding: 0;
    width: 100%;
}
.inbox-divider {
    border-bottom: 1px solid #d5d8df;
}
ul.inbox-nav li {
    display: inline-block;
    line-height: 45px;
    width: 100%;
}
ul.inbox-nav li a {
    color: #6a6a6a;
    display: inline-block;
    line-height: 45px;
    padding: 0 20px;
    width: 100%;
}
ul.inbox-nav li a:hover, ul.inbox-nav li.active a, ul.inbox-nav li a:focus {
    background: none repeat scroll 0 0 #d5d7de;
    color: #6a6a6a;
}
ul.inbox-nav li a i {
    color: #6a6a6a;
    font-size: 16px;
    padding-right: 10px;
}
ul.inbox-nav li a span.label {
    margin-top: 13px;
}
ul.labels-info li h4 {
    color: #5c5c5e;
    font-size: 13px;
    padding-left: 15px;
    padding-right: 15px;
    padding-top: 5px;
    text-transform: uppercase;
}
ul.labels-info li {
    margin: 0;
}
ul.labels-info li a {
    border-radius: 0;
    color: #6a6a6a;
}
ul.labels-info li a:hover, ul.labels-info li a:focus {
    background: none repeat scroll 0 0 #d5d7de;
    color: #6a6a6a;
}
ul.labels-info li a i {
    padding-right: 10px;
}
.nav.nav-pills.nav-stacked.labels-info p {
    color: #9d9f9e;
    font-size: 11px;
    margin-bottom: 0;
    padding: 0 22px;
}
.inbox-head {
    background: none repeat scroll 0 0 #41cac0;
    border-radius: 0 4px 0 0;
    color: #fff;
    min-height: 80px;
    padding: 20px;
}
.inbox-head h3 {
    display: inline-block;
    font-weight: 300;
    margin: 0;
    padding-top: 6px;
}
.inbox-head .sr-input {
    border: medium none;
    border-radius: 4px 0 0 4px;
    box-shadow: none;
    color: #8a8a8a;
    float: left;
    height: 40px;
    padding: 0 10px;
}
.inbox-head .sr-btn {
    background: none repeat scroll 0 0 #00a6b2;
    border: medium none;
    border-radius: 0 4px 4px 0;
    color: #fff;
    height: 40px;
    padding: 0 20px;
}
.table-inbox {
    border: 1px solid #d3d3d3;
    margin-bottom: 0;
}
.table-inbox tr td {
    padding: 12px !important;
}
.table-inbox tr td:hover {
    cursor: pointer;
}
.table-inbox tr td .fa-star.inbox-started, .table-inbox tr td .fa-star:hover {
    color: #f78a09;
}
.table-inbox tr td .fa-star {
    color: #d5d5d5;
}
.table-inbox tr.unread td {
    background: none repeat scroll 0 0 #f7f7f7;
    font-weight: 600;
}
ul.inbox-pagination {
    float: right;
}
ul.inbox-pagination li {
    float: left;
}
.mail-option {
    display: inline-block;
    margin-bottom: 10px;
    width: 100%;
}
.mail-option .chk-all, .mail-option .btn-group {
    margin-right: 5px;
}
.mail-option .chk-all, .mail-option .btn-group a.btn {
    background: none repeat scroll 0 0 #fcfcfc;
    border: 1px solid #e7e7e7;
    border-radius: 3px !important;
    color: #afafaf;
    display: inline-block;
    padding: 5px 10px;
}
.inbox-pagination a.np-btn {
    background: none repeat scroll 0 0 #fcfcfc;
    border: 1px solid #e7e7e7;
    border-radius: 3px !important;
    color: #afafaf;
    display: inline-block;
    padding: 5px 15px;
}
.mail-option .chk-all input[type="checkbox"] {
    margin-top: 0;
}
.mail-option .btn-group a.all {
    border: medium none;
    padding: 0;
}
.inbox-pagination a.np-btn {
    margin-left: 5px;
}
.inbox-pagination li span {
    display: inline-block;
    margin-right: 5px;
    margin-top: 7px;
}
.fileinput-button {
    background: none repeat scroll 0 0 #eeeeee;
    border: 1px solid #e6e6e6;
}
.inbox-body .modal .modal-body input, .inbox-body .modal .modal-body textarea {
    border: 1px solid #e6e6e6;
    box-shadow: none;
}
.btn-send, .btn-send:hover {
    background: none repeat scroll 0 0 #00a8b3;
    color: #fff;
}
.btn-send:hover {
    background: none repeat scroll 0 0 #009da7;
}
.sender-info {
    margin-bottom: 20px;
}
.sender-info img {
    height: 30px;
    width: 30px;
}
.sender-dropdown {
    background: none repeat scroll 0 0 #eaeaea;
    color: #777;
    font-size: 10px;
    padding: 0 3px;
}
.view-mail a {
    color: #ff6c60;
}
.attachment-mail {
    margin-top: 30px;
}
.attachment-mail ul {
    display: inline-block;
    margin-bottom: 30px;
    width: 100%;
}
.attachment-mail ul li {
    float: left;
    margin-bottom: 10px;
    margin-right: 10px;
    width: 150px;
}
.attachment-mail ul li img {
    width: 100%;
}
.attachment-mail ul li span {
    float: right;
}
.attachment-mail .file-name {
    float: left;
}
.attachment-mail .links {
    display: inline-block;
    width: 100%;
}

.fileinput-button {
    float: left;
    margin-right: 4px;
    overflow: hidden;
    position: relative;
}
.fileinput-button input {
    cursor: pointer;
    direction: ltr;
    font-size: 23px;
    margin: 0;
    opacity: 0;
    position: absolute;
    right: 0;
    top: 0;
    transform: translate(-300px, 0px) scale(4);
}
.fileupload-buttonbar .btn, .fileupload-buttonbar .toggle {
    margin-bottom: 5px;
}
.files .progress {
    width: 200px;
}
.fileupload-processing .fileupload-loading {
    display: block;
}
* html .fileinput-button {
    line-height: 24px;
    margin: 1px -3px 0 0;
}
* + html .fileinput-button {
    margin: 1px 0 0;
    padding: 2px 15px;
}
@media (max-width: 767px) {
.files .btn span {
    display: none;
}
.files .preview * {
    width: 40px;
}
.files .name * {
    display: inline-block;
    width: 80px;
    word-wrap: break-word;
}
.files .progress {
    width: 20px;
}
.files .delete {
    width: 60px;
}
}
ul {
    list-style-type: none;
    padding: 0px;
    margin: 0px;
}

This Joomla 3 override allows you to display a list of articles in a Gmail box style simply using the Joomla's mod_articles_category module. At the bottom of this article, you can download the files of the override.

Joomla 3 frontend rendering

PhP markup

><?php
/**
 * @package     Joomla.Site
 * @subpackage  mod_articles_category
 * @author	    web-eau.net
 * @copyright   Copyright (C) 2005 - 2018 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

?>
  
  <div class="container">
	<div class="row">
		<!-- First row -->
		<div class="col-12 col-sm-12 col-md-3 col-lg-3">
			<!-- Left column (First row) -->
			<a href="#" class="btn btn-danger btn-block">
				<i class="fa fa-edit"></i>&nbsp;Compose
			</a>
		</div>
		<div class="col-12 col-sm-12 col-md-9 col-lg-9">
			<!-- Left side buttons -->
			<div class="btn-group" role="group">
				<button type="button" class="btn btn-outline-secondary">&nbsp;<i class="fa fa-refresh" aria-hidden="true"></i>&nbsp;</button>
				<button type="button" class="btn btn-outline-secondary">&nbsp;<i class="fa fa-star" aria-hidden="true"></i>&nbsp;</button>
				<button type="button" class="btn btn-outline-secondary">&nbsp;<i class="fa fa-ellipsis-v" aria-hidden="true"></i>&nbsp;</button>
			</div>
			<!-- Right side buttons -->
			<div class="pull-right">
				<button type="button" class="btn btn-outline-secondary">&nbsp;<i class="fa fa-angle-left" aria-hidden="true"></i>&nbsp;</button>
				<button type="button" class="btn btn-outline-secondary">&nbsp;<i class="fa fa-angle-right" aria-hidden="true"></i>&nbsp;</button>
				<button type="button" class="btn btn-outline-secondary">&nbsp;<i class="fa fa-bars" aria-hidden="true"></i>&nbsp;</button>
				<button type="button" class="btn btn-outline-secondary">&nbsp;<i class="fa fa-cog" aria-hidden="true"></i>&nbsp;</button>
			</div>
		</div>
		<!-- END: Right column -->
		
	</div>
	<!-- END: first row -->
	<hr>
	<div class="row">
		<!-- Second row -->
		<div class="col-12 col-sm-12 col-md-3 col-lg-3">
			<!-- LEFT COLUMN Menu (Second row) -->
			<ul class="list-group">
				<!-- Menu -->
				<?php 
					$model = JModelLegacy::getInstance('Articles', 'ContentModel', array( 'ignore_request' => true )); 
					$params = JFactory::getApplication()->getParams();
					$model->setState('params', $params);
					$model->setState('filter.category_id', 62); // xxxx category ID 
					$num_articles = $model->getTotal();
					?>
				<li class="list-group-item d-flex active justify-content-between align-items-center py-2">
					Published
					<span class="badge badge-default badge-light"><?php echo $num_articles; ?></span>
				</li>
				<li class="list-group-item d-flex justify-content-between align-items-center py-2">
					Unpublished
					<span class="badge badge-secondary badge-pill">2</span>
				</li>
				<li class="list-group-item d-flex justify-content-between align-items-center py-2">
					Archived
					<span class="badge badge-secondary badge-pill">1</span>
				</li>
				<li class="list-group-item d-flex justify-content-between align-items-center py-2">
					Trashed
					<span class="badge badge-secondary badge-pill">0</span>
				</li>
			</ul>
			<!-- End left menu -->
		</div>
		<!-- END: Left column (Second row) -->
		<div class="col-12 col-sm-12 col-md-9 col-lg-9">
			<!-- Tabs -->
			<ul class="nav nav-tabs">
				<li class="nav-item">
					<a class="nav-link active"><i class="fa fa-inbox"></i>&nbsp;&nbsp;Inbox</a>
				</li>
				<li class="nav-item">
					<a class="nav-link"><i class="fa fa-users"></i>&nbsp;&nbsp;Social</a>
				</li>
				<li class="nav-item">
					<a class="nav-link"><i class="fa fa-tags"></i>&nbsp;&nbsp;Notifications</a>
				</li>
				<li class="nav-item">
					<a class="nav-link"><i class="fa fa-info-circle"></i>&nbsp;&nbsp;Updates</a>
				</li>
			</ul>
			<!-- END: Tabs -->
			<div class="list-group">
			
				<?php foreach ($list as $item) : ?>
				<ul class="list-inline d-flex articles-items">
				<li class="list-inline-item articles-items d-flex list-group-item justify-content-start">
					
					<span class="checkbox pr-2"><input type="checkbox"></span>
					
					<?php if ($item->featured == 1) : ?>						
						<span style="color: #EBC043" class="pr-2 fa fa-star"></span>				
                       <?php else : ?>
                        <span class="pr-2 fa fa-star-o"></span>
                       <?php endif; ?>
											
                  	<span class="name fullname"><?php echo $item->displayAuthorName; ?></span> 
                  
					<span class="title pr-2"><?php echo JHTML::_('string.truncate', $item->title, 33, false, false) ; ?></span>					
					<span class="pr-2"><?php echo JHTML::_('string.truncate', $item->introtext, 27, false, false) ; ?></span> <!-- titre + intro : maxi 70 caractères -->
					
					<span class="ml-auto pl-3">
						<span class="fa fa-paperclip"></span>
						<span class="badge badge-default badge-pill"><?php echo $item->displayDate; ?></span>
					</span>
				</li>
				</ul>
				<?php endforeach; ?>
				
			</div>
		</div>
	</div>
</div>

CSS

/* Gmail inbox */
.navbar {
	background-color: #f1f1f1;
	height: 62px;
}
.navbar .container {
	margin-top: 0px;
}
.navbar input {
	min-width: 360px;
}
.navbar input, .navbar button {
	border-radius: 0;
	border-right-width: 0;
	height: 34px;
}
.fullname {
	min-width: 70px;
	display: inline-block;
}
.title {
	display: inline-block;
  	font-weight: 600;
}
.articles-items{
min-width:780px;
}

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daniel@web-eau.net