JSFiddle - React, Tailwind, and code Playground

HTML

<div class="calendarDate">	<em>Saturday</em>
	<strong>December</strong>
	<span>21</span>
  <span>2018</span>
</div>

CSS

body {
    padding:15% 30%;
    font-family:"Segoe UI", Frutiger, "Frutiger Linotype", "Dejavu Sans", "Helvetica Neue", Arial, sans-serif;
    font-size: 100%;
    margin: 10px;
    color: #333;
    background-color: #cecece;
}
div.calendarDate {
    font-size:2em;
    /*change calendarIcon size */
    display: block;
    position: relative;
    width: 7em;
    height: 7em;
    background-color: #fff;
    border-radius: 0.7em;
    -moz-border-radius: 0.7em;
    box-shadow: 0 1px 0 #bdbdbd, 0 2px 0 #fff, 0 3px 0 #bdbdbd, 0 4px 0 #fff, 0 5px 0 #bdbdbd, 0 0 0 1px #bdbdbd;
    overflow: hidden;
}
div.calendarDate * {
    display: block;
    width: 100%;
    font-size: 1em;
    font-weight: bold;
    font-style: normal;
    text-align: center;
}
div.calendarDate strong {
    position: absolute;
    top: 0;
    padding: 0.4em 0;
    color: #fff;
    background-color: #19aaaa;
    border-bottom: 1px dashed #ddd;
    box-shadow: 0 2px 0 #19aaaa;
}
div.calendarDate em {
    position: absolute;
    bottom: 0em;
    color: #fff;
    padding-top:.2em;
    height: 1.6em;
    background-color: #19aaaa;
}
div.calendarDate span {
    font-size: 2.8em;
    letter-spacing: -0.05em;
    padding-top: 0.65em;
    color: #2f2f2f;
}