@media only screen and (max-width:500px) {
    .logo_crd{
        width: 40%;
    }
    .btn_abrir{
        bottom: 75px;
        right: 25px;
    }

    .page_title {
        position: relative;
        bottom: 20px;
        font-size: 18px;
    }

    #side_menu{
        bottom: 245px;
        width: 350px;
    }
  
}