css - Centering Elements Vertically with FlexBox -


attempting use flexbox (for demo purposes only). i'm having trouble vertically centering text within parent .top-nav-bar. using justify-content: space-between i'm able 2 elements need them horizontally, i'm having no luck centering .contact , .help vertically within .top-nav-bar. attempts seem butt text against top edge of page.

link codepen

html:

  header.section1.box     .top-nav-bar       .contact         p lorem ipsum dolor sit amet       .help         p lorem ipsum dolor sit amet

css:

.section1   background:     image: url(url/of/image.jpg)     size: cover     position: top center     repeat: no-repeat     attachment: fixed  .box   overflow: hidden   width: 100%   height: 100vh   background:     color: #90281f  .top-nav-bar   max-width: 1200px   width: 100%   height: 40px   margin: 0 auto   font-size: 0.813em   background: pink   display: flex   flex-direction: row   align-items: center   justify-content: space-between  .contact   background: red  .help   background: green

all attempts seem butt text against top edge of page.

but that's .top-nav-bar - it's div height 40px (as defined in css) , has no content before in html, on top of page.

if set .top-nav-bar { height: 100%; } .top-nav-bar height of it's parent (100vh) , it's contents can vertically centered (which have correctly instructed using align-items: center)

    .section1 {        background: url(url/of/image.jpg) top center no-repeat;  	  background-size: cover;  	  background-attachment: fixed;  	 }        .box {        overflow: hidden;        width: 100%;        height: 100vh;        background:#90281f;  	}            .top-nav-bar {        max-width: 1200px;        width: 100%;        height: 100%;        margin: 0 auto;        font-size: 0.813em;        background: pink;        display: flex;        flex-direction: row;        align-items: center;        justify-content: space-between;  	 }              .contact {        background: red  	 }            .help {        background: green  	 }
  <header class="section1 box">  	<div class="top-nav-bar">  	  <div class="contact">  		<p> lorem ipsum dolor sit amet</p>  	  </div>  	  <div class="help">  		<p> lorem ipsum dolor sit amet</p>  	  </div>  	</div>    </header>


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