changing classss in div or in style sheet

i have small problem wrt alignments of paragraphs

here it goes

i will make few posts blog post 1 , 2 , 3 ,4 ,5 etc

now in my posts i will be keeping

<div id="someidname">

blog contents goes here

</div>

but i havent written any id someidname in my blog

so later if i want to make it is some sort of fonts , sizes

can i able to achive this via stylesheet by making a suitable someidname entry ?

 

If you want to be able to change the font on ALL your posts at once - you can add class="post" to your div and add .post {css goes here} to the style sheet. No need to use ID unless it is post specific. ID's are used for single elements on a page, and classes are used multiple times per page.

 

thanks thats what i want i need to able to change via css later

+rep added