How can I combine multiple CSS rules?

Question

div#id_div_allposts {   
    width: 100%;    
}

div.class_div_post {
    width: 100%;
}

div.class_div_editdelete {
    width: 100%;
}

How can i write it in one line ?

And what's the way to select a html tag with id and class ?

Answer 1

All you have to do is separate them with a comma e.g

div#id_div_allposts,
div.class_div_post,
div.class_div_editdelete {
    width:100%;
}