html - Make border width wider than element (not using padding) -


screenshot of want achieve: (i covered logos , links)

enter image description here

i have header contains 2 element : logos section , navigation bar.

now trying create border-top nav element, 100% width of screen in given size.

i can not use padding-left-right , avoid using markup.

is achievable? using :before?

<header>     <div class="site-header">         stuff + full width border in middle!     </div>     <nav>         <ul>             <li>linka</li>             <li>link b</li>         </ul>     </nav> </header>   .site-header, nav {     max-width: 500px;     margin: 0 auto; }  nav {     border-top: 1px solid red;  }

fiddle: https://jsfiddle.net/oodrabm2/1/

your nav should outside header or need set width on site-header , ul not nav like:

.site-header, nav ul {      max-width: 500px;      margin: 0 auto;  }    nav {      border-top: 1px solid red;   }
<header>      <div class="site-header">          stuff + full width border in middle!      </div>      <nav>          <ul>              <li>linka</li>              <li>link b</li>          </ul>      </nav>  </header>


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