JSFiddle - React, Tailwind, and code Playground

HTML

<div class="calendar">
                <div id="calendartest1">
                    <h2>Test1</h2>
                    <div class="day">
                        <div class="dayname">
                            <p>Monday</p>
                        </div>
                        <div class="daycontent">
                            <a href="">test</a>
                            <a href="">test</a>
                            <a href="">test</a>
                        </div>
                    </div>
                    <div class="day">
                        <div class="dayname">
                            <p>Tuesday</p>
                        </div>
                        <div class="daycontent">
                            <a href="">test</a>
                            <a href="">test</a>
                            <a href="">test</a>
                        </div>
                    </div>
                    <div class="day">
                        <div class="dayname">
                            <p>Wednesday</p>
                        </div>
                        <div class="daycontent">
                            <a href="">test</a>
                            <a href="">test</a>
                            <a href="">test</a>
                        </div>
                    </div>
                    <div class="day">
                        <div class="dayname">
                            <p>Thusday</p>
                        </div>
                        <div class="daycontent">
                            <a href="">test</a>
                            <a href="">test</a>
                            <a href="">test</a>
                        </div>
                    </div>
                    <div class="day">
                        <div class="dayname">
                            <p>Friday</p>
                        </div>
                        <div class="daycontent">
                            <a href="">test</a>
       ...

CSS

.calendar {
    width: 850px;
    height: 500px;
    background-color: #141414;
    border-radius: 10px;
    padding-top: 10px;
    margin-top: 15px;
    margin-left: 15px;
}

#calendartest1{
    width: 778px;
    height: 200px;
    position: relative;
    margin-left: auto;
    margin-right: auto;
}

#calendartest2 {
    width: 778px;
    height: 200px;
    position: relative;
    margin-left: auto;
    margin-right: auto;
    margin-top: 50px;
}

#calendartest1 h2 {
    color: #999999;
    text-align: center;
    margin-top: 0px;
    margin-bottom: 0px;
}

#calendartest2 h2 {
    color: #999999;
    text-align: center;
    margin-top: 0px;
    margin-bottom: 0px;
}

.day {
    width: 110px;
    float:left;
    
    border-left: 1px solid #404040;
}

.dayname {
    text-align: center;
    background-color: #49CEFF;
    height: 30px;
    border-radius: 0px 5px 0px 5px;
    margin-left: 3px;
    margin-right: 3px;
    margin-top: -15px;
}

.dayname p {
    padding-top: 5px;
    color: white;
    font-weight: bold;
    text-shadow: 0px 0px 10px black;
}

.daycontent {
    text-align: center;
    margin-top: 5px;
    height: 160px;
}
.daycontent a:link, a:visited {
    display: block;
    margin-left: 2px;
    margin-right: 2px;
    margin-top: 2px;
    padding-top: 2px;
    padding-bottom: 2px;
    color: white;
    text-decoration: none;
    font-size: 12px;
}
.daycontent a:hover, a:active {
    background-color: black;
    color: #49ceff;
}