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HTML 

              
                <div id="calendar-wrap">
    		<header>
    			<h1>December 2017</h1>
    		</header>
    		<div id="calendar">
    			<ul class="weekdays">
    				<li>Sunday</li>
    				<li>Monday</li>
    				<li>Tuesday</li>
    				<li>Wednesday</li>
    				<li>Thursday</li>
    				<li>Friday</li>
    				<li>Saturday</li>
    			</ul>

    			<!-- Days from previous month -->

    			<ul class="days">
    				<li class="day other-month">
    					<div class="date">27</div>    					
    				</li>
    				<li class="day other-month">
    					<div class="date">28</div>
    					<div class="event">
    						<div class="event-desc">
    							HTML 5 lecture with Brad Traversy from Eduonix
    						</div>
    						<div class="event-time">
    							1:00pm to 3:00pm
    						</div>
    					</div>    					
    				</li>
    				<li class="day other-month">
    					<div class="date">29</div>    					
    				</li>
    				<li class="day other-month">
    					<div class="date">30</div>    					
    				</li>
    				<li class="day other-month">
    					<div class="date">31</div>    					
    				</li>

    				<!-- Days in current month -->

    				<li class="day">
    					<div class="date">1</div>    					
    				</li>
    				<li class="day">
    					<div class="date">2</div>
    					<div class="event">
    						<div class="event-desc">
    							Career development @ Community College room #402
    						</div>
    						<div class="event-time">
    							2:00pm to 5:00pm
    						</div>
    					</div>     					
    				</li>
    			</ul>

    				<!-- Row #2 -->

    			<ul class="days">
    				<li class="day">
    					<div class="date">3</div>    					
    				</li>
    				<li class="day">
    					<div class="date">4</div>    					
    				</li>
    				<li class="day">
    					<div class="date">5</div>    					
    				</li>
    				<li class="day">
    					<div class="date">6</div>    					
    				</li>
    				<li class="day">
    					<div class="date">7</div>
    					<div class="event">
    						<div class="event-desc">
    							Group Project meetup
    						</div>
    						<div class="event-time">
    							6:00pm to 8:30pm
    						</div>
    					</div>     					
    				</li>
    				<li class="day">
    					<div class="date">8</div>    					
    				</li>
    				<li class="day">
    					<div class="date">9</div>    					
    				</li>
    			</ul>

    				<!-- Row #3 -->

    			<ul class="days">
    				<li class="day">
    					<div class="date">10</div>    					
    				</li>
    				<li class="day">
    					<div class="date">11</div>    					
    				</li>
    				<li class="day">
    					<div class="date">12</div>    					
    				</li>
    				<li class="day">
    					<div class="date">13</div>    					
    				</li>
    				<li class="day">
    					<div class="date">14</div><div class="event">
    						<div class="event-desc">
    							Board Meeting
    						</div>
    						<div class="event-time">
    							1:00pm to 3:00pm
    						</div>
    					</div>     					
    				</li>
    				<li class="day">
    					<div class="date">15</div>    					
    				</li>
    				<li class="day">
    					<div class="date">16</div>    					
    				</li>
    			</ul>

    				<!-- Row #4 -->

    			<ul class="days">
    				<li class="day">
    					<div class="date">17</div>    					
    				</li>
    				<li class="day">
    					<div class="date">18</div>    					
    				</li>
    				<li class="day">
    					<div class="date">19</div>    					
    				</li>
    				<li class="day">
    					<div class="date">20</div>    					
    				</li>
    				<li class="day">
    					<div class="date">21</div>    					
    				</li>
    				<li class="day">
    					<div class="date">22</div>
    					<div class="event">
    						<div class="event-desc">
    							Conference call
    						</div>
    						<div class="event-time">
    							9:00am to 12:00pm
    						</div>
    					</div>     					
    				</li>
    				<li class="day">
    					<div class="date">23</div>    					
    				</li>
    			</ul>

    					<!-- Row #5 -->

    			<ul class="days">
    				<li class="day">
    					<div class="date">24</div>    					
    				</li>
    				<li class="day">
    					<div class="date">25</div>
    					<div class="event">
    						<div class="event-desc">
    							Conference Call
    						</div>
    						<div class="event-time">
    							1:00pm to 3:00pm
    						</div>
    					</div>     					
    				</li>
    				<li class="day">
    					<div class="date">26</div>    					
    				</li>
    				<li class="day">
    					<div class="date">27</div>    					
    				</li>
    				<li class="day">
    					<div class="date">28</div>    					
    				</li>
    				<li class="day">
    					<div class="date">29</div>    					
    				</li>
    				<li class="day">
    					<div class="date">30</div>    					
    				</li>
    			</ul>

    			<!-- Row #6 -->

    			<ul class="days">
    				<li class="day">
    					<div class="date">31</div>    					
    				</li>
    				<li class="day other-month">
    					<div class="date">1</div> <!-- Next Month -->    					
    				</li>
    				<li class="day other-month">
    					<div class="date">2</div>    					
    				</li>
    				<li class="day other-month">
    					<div class="date">3</div>    					
    				</li>
    				<li class="day other-month">
    					<div class="date">4</div>    					
    				</li>
    				<li class="day other-month">
    					<div class="date">5</div>    					
    				</li>
    				<li class="day other-month">
    					<div class="date">6</div>    					
    				</li>
    			</ul>

    		</div><!-- /. calendar -->
    	</div><!-- /. wrap -->
!

CSS 

              
                body {
	font-family: Tahoma;
}

header {
	text-align: center;
}

#calendar {
	width: 100%;	
}

#calendar a {
	color: #8e352e;
	text-decoration: none;
}

#calendar ul {
	list-style: none;
	padding: 0;
	margin: 0;
	width: 100%;
}

#calendar li {
	display: block;
	float: left;
	width:14.342%;
	padding: 5px;
	box-sizing:border-box;
	border: 1px solid #ccc;
	margin-right: -1px;
	margin-bottom: -1px;
}

#calendar ul.weekdays {
	height: 40px;
	background: #8e352e;
}

#calendar ul.weekdays li {
	text-align: center;
	text-transform: uppercase;
	line-height: 20px;
	border: none !important;
	padding: 10px 6px;
	color: #fff;
	font-size: 13px;
}

#calendar .days li {
	height: 180px;
}

#calendar .days li:hover {
	background: #d3d3d3;
}

#calendar .date {
	text-align: center;
	margin-bottom: 5px;
	padding: 4px;
	background: #333;
	color: #fff;
	width: 20px;
	border-radius: 50%;
	float: right;
}

#calendar .event {
	clear: both;
	display: block;
	font-size: 13px;
	border-radius: 4px;
	padding: 5px;
	margin-top: 40px;
	margin-bottom: 5px;
	line-height: 14px;
	background: #e4f2f2;
	border: 1px solid #b5dbdc;
	color: #009aaf;
	text-decoration: none;
}

#calendar .event-desc {
	color: #666;
	margin: 3px 0 7px 0;
	text-decoration: none;	
}

#calendar .other-month {
	background: #f5f5f5;
	color: #666;
}

/* ============================
				Mobile Responsiveness
   ============================*/


@media(max-width: 768px) {

	#calendar .weekdays, #calendar .other-month {
		display: none;
	}

	#calendar li {
		height: auto !important;
		border: 1px solid #ededed;
		width: 100%;
		padding: 10px;
		margin-bottom: -1px;
	}

	#calendar .date {
		float: none;
	}
}
!

JS 

              
                // #8e352e
// #c84c44
// #a53d36
!
999px

Console