JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://cdn.jsdelivr.net/picnicss/6.2.4/picnic.min.css">
<script src="https://npmcdn.com/flatpickr"></script>
<link rel="stylesheet" href="https://npmcdn.com/flatpickr/dist/themes/material_blue.css">
<input type="text" class="flatpickr">
<input type="text" class="flatpickr2">
<input type="text" class="flatpickr3">
<input type="text" class="flatpickr4">

CSS

body {
  background:#F3F5F6
}
.date {
    float: left;
    width: 45px;
    text-align: center;
    z-index: 1;
    position: relative;
    height: 40px;
    line-height: 40px;
    color: #d0d0d0;
}

.cont {
padding: 40px;
    background: white;
    margin: 50px;
    width: 530px;
    height: 120px;
   }
     
.busy {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    z-index: -1;
}

JavaScript

flatpickr(".flatpickr", {
    inline: true,
});

flatpickr(".flatpickr2", {
    inline: true,
});

flatpickr(".flatpickr3", {
    inline: true,
});

flatpickr(".flatpickr4", {
    inline: true,
});