@media screen and (max-width: 550px) {

    #mailing_list_container .mailing_list_button,
    .twitter,
    .youtube,
    .facebook,
    #mammalian_logo{
        display: none;
    }

    #center_content_container{
        margin-top: 0px;
    }

    .mailing_list_button{
        margin: auto;
        float: none;
    }

}