div#blog_post_form_wrapper {
    padding: 5px;
    border: 1px solid #ccc;
}

#acme_hellobundle_blog_titulo,
#acme_hellobundle_blog_contenido{
    width: 100%;
    box-sizing: border-box;
    min-height: 30px;
}

div#post_blog_comment div {
    width: 100%;
    min-height: 40px;
}

button#acme_hellobundle_blog_submit {
    margin-left: auto;
    margin-right: auto;
    width: 100px;
    float: none;
}