JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link rel="stylesheet" href="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<body>
    <form name="form" method="post" action="./" id="form">
<div>
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJMjM4NTMxOTg2D2QWAgIDD2QWAgIBDxYCHglpbm5lcmh0bWwFEEFSTUkgREkgSUdPUiBTUkxkZPuruLXvtpE7UNVIM7+f5lBf/KTJaM2DarClVMLijJJT">
</div>

<div>

	<input type="hidden" name="__VIEWSTATEGENERATOR" id="__VIEWSTATEGENERATOR" value="CA0B0334">
</div>
        <header>
            <small id="negozio" hidden="hidden">ARMI DI IGOR SRL</small>
            <nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top">
                <a class="navbar-brand" role="button">
                    <img src="assets/img/sunny.svg" style="width: 30px;">
                </a>
                <a class="navbar-brand text-white" onclick="return false;" href="#" id="day" data-giorno="Thu Jan 09 2020 09:36:36 GMT+0100 (Ora standard dell’Europa centrale)">09 gennaio 2020</a>
                <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#nav" aria-controls="nav" aria-expanded="false" aria-label="Toggle navigation">
                    <span class="navbar-toggler-icon"></span>
                </button>

                <div class="collapse navbar-collapse" id="nav">
                    <ul class="navbar-nav ml-auto">
                        <li class="nav-item">
                            <a href="#" id="btnClienti" class="nav-link text-white">Clienti</a>
                        </li>
                        <li class="nav-item">
                            <a href="#"...

CSS

body {
    font-family: 'Open Sans', sans-serif;
    padding-top: 3.4rem;
    padding-bottom: 3rem;
    overflow:hidden;
}

html {
    overflow:hidden;
}

html, body {
    height: 100%;
}

/*::-webkit-scrollbar {
    display: none;
}*/


#titleSale {
    text-transform: lowercase;
}

    #titleSale::first-letter {
        text-transform: uppercase;
    }


.dropdown-item {
    text-transform: lowercase;
}

.dropdown-item::first-letter {
    text-transform: uppercase;
}

.container-fluid {
    padding-left:0;
    padding-right:0;
}

.footer {
    z-index:9;
    position: absolute;
    bottom: 0;
    width: 100%;
    /* Set the fixed height of the footer here */
    height: 60px;
    line-height: 60px; /* Vertically center the text there */
    background-color: #f5f5f5;
}

h3 {
    margin-top: 0px;
}

.noselect {
    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Safari */
    -moz-user-select: none; /* Firefox */
    -ms-user-select: none; /* Internet Explorer/Edge */
    user-select: none; /* Non-prefixed version, currently */
}

.dot {
    height: 10px;
    width: 10px;
    border-radius: 50%;
    display: inline-block;
    margin-left: 15px;
}


#prenota {
 margin-bottom: 5px;
}

.tag {
    position: absolute;
    width: 100px;
    height: 46px;
    z-index: 100;
    top: 0px;
    display: flex;
    align-items: center;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    font-weight: bold;
    padding: 5px;
    color: white;
}



.modal-header {
    background-color: #ffffff;
}

.modal-body {
    height: auto;
}

.error {
    color: red;
    text-shadow: 1px 1px 1px #ccc;
    font-size: 70px;
}

.fa {
    width: auto;
}

.table-row {
    cursor: pointer;
}

.table td, .table th {
    padding: .75rem;
    vertical-align: top;
    border-top: 1px solid #dee2e6;
    width: 100px;
}

.h {    
    font-size: 12px;
    margin: 0px;
}

t-head {
    padding: 0px;
    border: 0;
    z-index: 3;
}

t-angle {
 ...