Show Nav On Scroll

index.html

<main>
  <nav>
    <a href="#cover"><h3>Cover</h3></a>
    <a href="#section-one"><h3>One</h3></a>
    <a href="#section-two"><h3>Two</h3></a>
    <a href="#section-three"><h3>Three</h3></a>
  </nav>
  <section id="cover" class="cover">
    <h1>Cover</h1>
    <p>Scroll</p>
  </section>
  <section id="section-one" class="content">
    <div>
      <h2>Section One</h2>
      <img src="http://placekitten.com/1280/600" />
      <p>Dolorem rerum et aspernatur inventore quasi et quod doloremque exercitationem sunt adipiscing facilis possimus minus labore exercitationem aspernatur ipsam voluptatibus excepturi nihil! Voluptatem dolores id accusantium temporibus assumenda et atque unde consectetur fugit sit qui voluptas fugit dolore nihil quidem tempore consequuntur similique reprehenderit et rerum. Velit corporis consequatur nesciunt est corporis et qui quod. Recusandae qui consequatur itaque inventore hic molestiae labore dolores rerum veniam culpa dolorem velit in molestiae voluptatem. Non sed quod animi excepturi sapiente obcaecati quod.</p>
    </div>
  </section>
  <section id="section-two" class="content">
    <div>
      <h2>Section Two</h2>
      <img src="http://placekitten.com/1180/500" />
      <p>Dolorem rerum et aspernatur inventore quasi et quod doloremque exercitationem sunt adipiscing facilis possimus minus labore exercitationem aspernatur ipsam voluptatibus excepturi nihil! Voluptatem dolores id accusantium temporibus assumenda et atque unde consectetur fugit sit qui voluptas fugit dolore nihil quidem tempore consequuntur similique reprehenderit et rerum. Velit corporis consequatur nesciunt est corporis et qui quod. Recusandae qui consequatur itaque inventore hic molestiae labore dolores rerum veniam culpa dolorem velit in molestiae voluptatem. Non sed quod animi excepturi sapiente obcaecati quod.</p>
    </div>
  </section>
  <section id="section-three" class="content">
    <div>
      <h2>Section Three</h2>
      <img src="http://placekitten.com/980/450" />
      <p>Dolorem rerum et aspernatur inventore quasi et quod doloremque exercitationem sunt adipiscing facilis possimus minus labore exercitationem aspernatur ipsam voluptatibus excepturi nihil! Voluptatem dolores id accusantium temporibus assumenda et atque unde consectetur fugit sit qui voluptas fugit dolore nihil quidem tempore consequuntur similique reprehenderit et rerum. Velit corporis consequatur nesciunt est corporis et qui quod. Recusandae qui consequatur itaque inventore hic molestiae labore dolores rerum veniam culpa dolorem velit in molestiae voluptatem. Non sed quod animi excepturi sapiente obcaecati quod.</p>
    </div>
  </section>
</main>

Show Nav On Scroll.markdown

Show Nav On Scroll

Uses fixed & relative positioning with z-indexes to reveal the nav bar after you scroll past a cover element. This demo also uses a mixin for creating responsive layouts found here: http://codepen.io/abergin/pen/WvOWdx/

A Pen by Alex Bergin on CodePen.

License.

style.css

@import "compass"

$color-active: rgba( 255 , 55 , 71 , 1 )
$color-white: rgba( 245 , 250 , 255 , 1 )
$color-black: rgba( 5 , 15 , 30 , 1 )
$sans: 'Titillium Web', sans-serif

html , body
  position: relative
  width: 100%
  
html
  background-color: $color-white
  overflow-x: hidden
  height: 100%
  font-size: 0
  
body
  overflow: hidden
  
section
  @include contain( padding-top , 5vw , 15px , 60px )
  background-color: shade( $color-white , 5% )
  position: relative
  display: block
  
  &:last-of-type
    @include contain( padding-bottom , 5vw , 15px , 60px )
  
.cover
  height: 100vh
  box-sizing: border-box
  background-color: $color-active
  z-index: 3
  
  h1
    @include translate( -50% , -50% )
    @include contain( padding , 5vw , 15px , 60px )
    background-color: $color-white
    line-height: 75%
    color: $color-active
    display: inline-block
    position: absolute
    left: 50%
    top: 50%
    
  p
    @include contain( padding , 2vw , 10px , 20px )
    @include contain( bottom , 2vw , 10px , 20px )
    color: $color-white
    position: absolute
    box-sizing: border-box
    width: 100%
    text-align: center
    
    &:before
      content: ""
      @include contain( bottom , 1vw , 0 , 10px )
      position: absolute
      left: 50%
      border-top: 6px solid $color-white
      border-left: 6px solid transparent
      border-right: 6px solid transparent
      margin-left: -6px
  
.content
  z-index: 1
  text-align: center
  
  div
    background-color: $color-white
    @include contain( padding-top , 5vw , 15px , 60px )
    box-sizing: border-box
    display: inline-block
    text-align: left
    max-width: 100%
    width: 900px
    
    h2 , img , p , hr
      @include contain( margin-bottom , 5vw , 15px , 60px )
      
    img
      &:last-child

        // need to modify the contain mixin to use a selector?
        // idk, but using important or making a second include
        // to reset for cases like this is not ideal 
        margin-bottom: 0 !important
      
    h2 , p
      @include contain( padding-right , 5vw , 15px , 60px )
      @include contain( padding-left , 5vw , 15px , 60px )
      
    img
      @include transition( opacity 0.3s ease-in-out )
      opacity: 0.95
      width: 100%
      height: auto
      
      &:hover
        opacity: 1
  
nav
  @include contain( padding , 5vw , 10px , 40px )
  background-color: $color-black
  position: fixed
  text-align: center
  z-index: 2
  right: 0
  left: 0
  top: 0
  
  a
    @include contain( padding , 4vw , 3px , 20px )
    padding-top: 0 !important
    padding-bottom: 0 !important
    display: inline-block
    color: $color-white
    text-decoration: none
    text-transform: uppercase
    
    border-left: 1px solid tint( $color-black , 33% )
    border-left: 1px solid tint( $color-black , 33% )
    
    &:first-of-type
      border-left: none
    
  
h1 , h2 , h3 , p
  letter-spacing: 0.05em
  line-height: 135%
  font-family: $sans
  
h1 , h3
  text-transform: uppercase
  
h1
  @include contain( font-size , 12vw , 30px , 120px )
  color: $color-active
  
h2
  @include contain( font-size , 10vw , 20px , 70px )
  text-align: center
  color: $color-active
  
p
  @include contain( font-size , 4vw , 14px , 21px )
  
h3
  @include contain( font-size , 4vw , 10px , 15px )

styles

<link href="http://codepen.io/abergin/pen/VLzWPb" rel="stylesheet" />
<link href="http://fonts.googleapis.com/css?family=Titillium+Web:300,700,300italic" rel="stylesheet" />