php - How to get back a Header in Wordpress once removed? -

at first wanted remove header on few pages. used code:

/* hide header menu ()/ */ .page-id- #header-space, .page-id- #header-outer {     display: none; } .page-id- #header-secondary-outer {     display: none; } .page-id- #footer-outer {     display: none; } 

i can't figure out how bring header these pages, deleted code 'appearance - editor) didn't seem work. can help?

display: block 

should it. display: block opposit of display: none.