.selecao-bordas, .selecao-details {
    overflow: auto;
}
.content {
    display: inline-block;
}


<div class="container">
    <form>
        <br>
        Bordas
        <div class="selecao-bordas col-lg-12 col-md-12 col-sm-12 col-xs-12">
            <div class="content">
                <?php include("bordas.php"); ?>
            </div>
        </div>

        <br>
        Detalhes

        <div class="selecao-details col-lg-12 col-md-12 col-sm-12 col-xs-12">
            <div class="content">
                <?php include("detalhes.php"); ?>
            </div>
        </div>

        <br>
        Nível do Clã

        <?php include("clanlevel.php"); ?>

    </form>
</div>