css first element

1:first-child {
2	//styles here
3}
4
5:nth-child(1) { //the benefit of this is you can do it for 2nd, 3rd etc...
6	//styles here 
7}

1:first-of-type {
2	//styles here
3}
4
5:first-child {
6	//styles here
7}
8
9:nth-child(1) { //the benefit of this is you can do it for 2nd, 3rd etc...
10	//styles here 
11}

1p:first-child {
2  font-size: 1.5em;
3}

1p:first-of-type {
2  font-size: 1.25em;
3}

1#content div:first-child {
2/*css*/
3}

1#content_id div.class_name:first-child {
2	/*your style*/
3}