JSFiddle - React, Tailwind, and code Playground

by Gwyn Milcote

HTML

<div class='mainpage'>

<div class='nav'>
  <div class='nav_link'>hh</div>
  <div class='nav_link'>hh</div>
  <div class='nav_link'>hh</div>
  <div class='nav_link'>hh</div>
  <div class='nav_link'>hh</div>
</div>

<div class='article'>
  Content
</div>

</div>

CSS

html,
body {
  margin: 0;
  height: 100%;
}

* {box-sizing:border-box;}


.header {
  position: fixed;
  z-index: 2;
  top: 0;
  left: 0;
  width: 100%;
  height: 50px;
  background-image: url(https://images.pexels.com/photos/159020/sunset-sky-afterglow-evening-sky-159020.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500);
  
  padding: 10px;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
}



.nav {
  position: fixed;
  z-index: 1;
  top: 50px;
  left: 0;
  width: 200px;
  height: calc(100% - 20px);
  background-image: url(https://images.pexels.com/photos/159020/sunset-sky-afterglow-evening-sky-159020.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500);
  border-right: 1px solid #d9d9d9;
  overflow: auto;
}

.nav_link {border:1px solid red;padding:5px;margin:5px;}

.mainpage {
  width: 100%;
  position: relative;
  top: 50px;
  display: flex;
  flex-direction: row;
}

.article {
  background: #F3F3F5;
  position: relative;
  top: 0px;
  left: 200px;
  width: calc(100% - 200px);
  
  height: 2000px;
  padding: 10px;
  background-image: url('http://griffusion.elementfx.com/pics/ui/bg-day.jpg');
  background-attachment: fixed;
}

@media (max-width: 800px) {
  .nav {width: 150px;}
  .article {width: calc(100% - 150px);left:150px;}
}

@media (max-width: 600px) {
  .nav {
    width: 100%;
    height: 50px;
    max-height: 100px;
    text-align: center;
  }
  .nav_link {
    display: inline-block;
  }
  .mainpage {flex-direction: column;}
  
  .article {
    width:100%;
    position: relative;
    top: 50px;
    left: 0;
  }
  
}