<div class="back"></div>
<nav>
  <a href="#">About</a>
  <a href="#">Works</a>
  <a href="#">Partners</a>
  <a href="#">Price</a>
  <a href="#">Contacts</a>
</nav>

<!-- Unsplash copyright -->
<a class="thx" style="background-color:black;color:white;text-decoration:none;padding:4px 6px;font-family:-apple-system, BlinkMacSystemFont, &quot;San Francisco&quot;, &quot;Helvetica Neue&quot;, Helvetica, Ubuntu, Roboto, Noto, &quot;Segoe UI&quot;, Arial, sans-serif;font-size:12px;font-weight:bold;line-height:1.2;display:inline-block;border-radius:3px;" href="http://unsplash.com/@oldskool2016?utm_campaign=photographer-credit" target="_blank" rel="noopener noreferrer" title="Download free do whatever you want high-resolution photos from paul morris"><span style="display:inline-block;padding:2px 3px;"><svg xmlns="http://www.w3.org/2000/svg" style="height:12px;width:auto;position:relative;vertical-align:middle;top:-1px;fill:white;" viewBox="0 0 32 32"><title></title><path d="M20.8 18.1c0 2.7-2.2 4.8-4.8 4.8s-4.8-2.1-4.8-4.8c0-2.7 2.2-4.8 4.8-4.8 2.7.1 4.8 2.2 4.8 4.8zm11.2-7.4v14.9c0 2.3-1.9 4.3-4.3 4.3h-23.4c-2.4 0-4.3-1.9-4.3-4.3v-15c0-2.3 1.9-4.3 4.3-4.3h3.7l.8-2.3c.4-1.1 1.7-2 2.9-2h8.6c1.2 0 2.5.9 2.9 2l.8 2.4h3.7c2.4 0 4.3 1.9 4.3 4.3zm-8.6 7.5c0-4.1-3.3-7.5-7.5-7.5-4.1 0-7.5 3.4-7.5 7.5s3.3 7.5 7.5 7.5c4.2-.1 7.5-3.4 7.5-7.5z"></path></svg></span><span style="display:inline-block;padding:2px 3px;">paul morris</span></a>
@import url('https://fonts.googleapis.com/css?family=Oswald:500');
.back{
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background:url(https://pp.userapi.com/c841122/v841122831/327e/nHt-92F6yc4.jpg) no-repeat top center #efeff1;
  background-size:cover;
}
.thx{
  position: fixed;
  left:50%;
  transform:translateX(-50%);
  bottom: 15px;
}
nav{
  width: 100%;
  position: fixed;
  top:50px;
  text-align:center;
}
nav a{
  font-family: 'Oswald', sans-serif;
  font-weight:500;
  text-transform:uppercase;
  text-decoration:none;
  color:#16151b;
  margin:0 15px;
  font-size:16px;
  letter-spacing:1px;
  position:relative;
  display:inline-block;
}
nav a:before{
  content:'';
  position: absolute;
  width: 100%;
  height: 3px;
  background:#16151b;
  top:47%;
  animation:out 0.2s cubic-bezier(1, 0, 0.58, 0.97) 1 both;
}
nav a:hover:before{
  animation:in 0.2s cubic-bezier(1, 0, 0.58, 0.97) 1 both;

}
@keyframes in{
  0%{
    width: 0;
    left:0;
    right:auto;
  }
  100%{
    left:0;
    right:auto;
    width: 100%;
  }
}
@keyframes out{
  0%{
    width:100%;
    left: auto;
    right: 0;
  }
  100%{
    width: 0;
    left: auto;
    right: 0;
  }
}
@keyframes show{
  0%{
    opacity:0;
    transform:translateY(-10px);
  }
  100%{
    opacity:1;
    transform:translateY(0);
  }
}

@for $i from 1 through 5 {
  nav a:nth-child(#{$i}){
    animation:show .2s #{$i*0.1+1}s ease 1 both;
  }
}
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External CSS

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External JavaScript

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