css align menu center

Hi everyone,

I really need your help please, I am actually trying to align my menu in the center but it stays on the left :(
I clicked on the eye, went to text align and tried to put it in the center and even on the right. But it doesn’t work.
I’ve just started to create this website, for the moment I only changed the menu colour with custom css (and tried to center my menu)

So, this is my website: www.markandfreight.com

-and what all I have in my page “”custom CSS””:
#wr-megamenu-menu-3.wr-mega-menu.nav-menu {
background-color: #29949e;
text-align: right;
}

#masthead_TesseractTheme.site-header.pos-relative.menusize-fullwidth.no-header-image {
background-color: #29949e;
text-align: right;
}

Merci !