nencor on "CSS doesn't affect to author role"

i am using easel 3.3.1 . i have some text like this

<biru>asdfasdf</biru>
<hijau>asdfadsfasdf</hijau>
<merah>asdfasdf</merah>
<ungu>asdfasdf</ungu>

then i made some css code on my style-default.css . it goes like this

biru{
	color :blue;
}

hijau{
	color :green;
}

merah{
	color :red;
}

ungu{
	color:purple;
}

it works when i made some post that belong to administrator. when i tested it on my author account, the css is not showing, the text color didn't change. how do i resolve this ?

thanks