to class sto css dhlwnetai ws ekshs:

.class1 {border:0};

meta sto html mporeis auto to class na to dwseis OPOU Theleis se opoiodhpote tag px:    <p class=class1>

to id einai diaforetiko . sto css to dhlwneis etsi

#newid {border:0;background-color:red;} klp/....

meta sto html gioa na dhlwseis to id pou thes

table id="newid"

OMWS ....efoson exeis dwsei ena id mporeis ean tgheleis MESA SE AUTO TO ID na kathorizeis pws tha emfanizetai h paragraphos sou ta grammata ta links klp...

px ean exeis kathorisei genika sto site h paragraphos sou na einai kokkinh sto css : px

p {color:red}

mporeis sto newid na kathoriseis i paragradfos na fainete mple XWRIS OMWS NA anagkazesai na dineis ena kainourgio class sthn paragapho. me liga logia to id sou epitrepei na theseis mia mnea perioxi sto site sou sthn opoia mporeis na allazeis tis idothtes tou keimenou twn links klp px:

#newid {border:0;background-color:red;} klp/....

etsi ean thes mesa edw h paragrahpos n einai mple polu apla grafris sto css

#newid p {color:blue} 

me to class den mporeis na kaneis kati tetoio giati dhlwnete me .   mporeis na to xrhsimopoihseis se opoiodhpote tag theleis alla den mporeis na exeis "sygxwneysh"

ama exeis kamia apo ria pes