Can anyone tell me how to put mulitiple classes with in the same div tag..

Such as <div class="lgmidtext"></div>

I should be able to add multiple classes to the tag but I just don't know how. Is it with a colon,comma or semicolon. Or maybe something else. Who knows... maybe I am wrong it just can't be done.

I need someone to clarify this for me.

No comma or anything, just a space
class="class1 class2"