header.php

<div class="card ">
    <div class="card-header">
        <p> Stock control application </p>
    </div>
    <div class="card-body">
        <div class="row text-center mt-2">

            <div class="col-md-3 col-6"><a class="btn btn-primary btn-block"
                                           style="background-color:#22bcff; color:#fff" href="index.php" role="button">Home</a>
            </div>
            <div class="col-md-3 col-6"><a class="btn btn-primary btn-block"
                                           style="background-color:#22bcff; color:#fff" href="nuovo_ordine.php"
                                           role="button">Nuovo ordine</a></div>
            <div class="col-md-3 col-6"><a class="btn btn-primary btn-block"
                                           style="background-color:#22bcff; color:#fff" href="storico_ordini.php"
                                           role="button">Storico ordini</a></div>
            <div class="col-md-3 col-6"><a class="btn btn-primary btn-block"
                                           style="background-color:#22bcff; color:#fff" href="controllo_dotazioni.php"
                                           role="button">Controllo dotazioni</a></div>

        </div>
    </div>
    <hr>