test

style.css

/*
<div id="id_1">
<div class="class_1">TEXT_1</div>
<div id="id_2" class="class_1">TEXT_2</div>
</div>
*/
div
{
	color: black;
}
div.class_1
{
	color: red;
}
div .class_1
{
	color: green;
}
#id_2
{
	color: blue;
}
#id_1 .class_1
{
	color: yellow;
}
#id_2 .class_1
{
	color: cyan;
}
#id_2.class_1
{
	color: white;
}