SOURCE

<div class="container">
	<div class="calendar">
		<div class="month">March</div>
		<div class="drawing">
			<div class="miffy">
				<div class="head">
					<div class="ears"></div>
					<div class="eyes"></div>
					<div class="mouth"></div>
				</div>
				<div class="body"></div>
			</div>
		</div>
		<ul class="days">
			<li></li>
			<li></li>
			<li>1</li>
			<li>2</li>
			<li>3</li>
			<li>4</li>
			<li>5</li>
			<li>6</li>
			<li class="current">7</li>
			<li>8</li>
			<li>9</li>
			<li>10</li>
			<li>11</li>
			<li>12</li>
			<li>13</li>
			<li>14</li>
			<li>15</li>
			<li>16</li>
			<li>17</li>
			<li>18</li>
			<li>19</li>
			<li>20</li>
			<li>21</li>
			<li>22</li>
			<li>23</li>
			<li>24</li>
			<li>25</li>
			<li>26</li>
			<li>27</li>
			<li>28</li>
			<li>29</li>
			<li>30</li>
			<li>31</li>
			<li></li>
			<li></li>
		</ul>
	</div>
</div>

*{
	box-sizing:border-box;
	padding:0;
	margin:0;
}
body{
	background:#30b9f7;
	font-family:sans-serif;
}
.container{
	width:100%;
	height:100vh;
	display:flex;
	align-items:center;
	justify-content:center;
}
.calendar{
	position:relative;
	width:255px;
	padding:5px;
	border-radius:3px;
	color:#333;
	background:#FFF;
	box-shadow:3px 3px 0 rgba(0,0,0,0.25);
}
.month{
	width:100%;
	height:35px;
	border-radius:3px 3px 0 0;
	color:#FFF;
	font-weight:700;
	line-height:35px;
	text-align:center;
	text-transform:uppercase;
	background:#f36897;
}
.days{
	display:flex;
	flex-flow:row wrap;
	list-style-type:none;
}
.days li{
	display:inline-block;
	width:35px;
	height:35px;
	font-size:0.9em;
	line-height:35px;
	text-align:center;
}
.days li:nth-child(7n){
	font-weight:700;
	color:#f36897;
}
.days .current{
	border-radius:3px;
	background:#f36897;
	color:#FFF;
}
.drawing{
	position:relative;
	width:100%;
	height:125px;
	margin-bottom:5px;
	border-radius:0 0 3px 3px;
	overflow:hidden;
	background:pink;
}
.miffy{
	position:absolute;
	top:50%;
	right:17.5%;
}
.head{
	position:relative;
	z-index:10;
	width:50px;
	height:40px;
	margin:auto;
	border-radius:25px;
	background:#FFF;
	box-shadow:0 0 0 2px #333;
}
.ears{
	position:absolute;
	width:100%;
	top:-80%;
}
.ears:before,
.ears:after{
	position:absolute;
	content:'';
	top:0;
	width:12px;
	height:35px;
	border-radius:75% 75% 50% 50%;
	box-shadow:0 5px 0 0px #FFF, 0 0 0 2px #333;
	background:#FFF;
}
.ears:before{
	left:15%;
	transform:rotate(-7.5deg);
}
.ears:after{
	right:15%;
	transform:rotate(7.5deg);
}
.eyes{
	position:absolute;
	width:100%;
	top:35%;
}
.eyes:before,
.eyes:after{
	position:absolute;
	content:'';
	width:4px;
	height:5px;
	border-radius:50%;
	background:#333;
}
.eyes:before{
	left:22.5%;
}
.eyes:after{
	right:22.5%;
}
.mouth{
	position:absolute;
	width:100%;
	top:80%;
}
.mouth:before,
.mouth:after{
	position:absolute;
	content:'';
	left:0;
	right:0;
	margin:auto;
	width:8px;
	height:2px;
	background:#333;
	border-radius:25px;
}
.mouth:before{
	transform:rotate(30deg);
}
.mouth:after{
	transform:rotate(-40deg);
}
.body{
	position:relative;
	width:60px;
	height:75px;
	margin:-5px auto;
	border-radius:35px 35px 0 0;
	background:#f1733f;
	box-shadow:0 0 0 2px #333;
}