JSFiddle - React, Tailwind, and code Playground

by Ea Bangalore

HTML

<div id="wrapper" class="toggled hidden-xs">
        <!-- Sidebar -->
        <div id="sidebar-wrapper">
                <ul class="sidebar-nav">
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                </ul>
        </div>
      <div class="stories-preview-wrapper">
             <ul class="sidebar-nav">
                  <li>hello world 2</li>
                  <li>hello world 2</li>
              </ul>
      </div>
 </div>

CSS

#wrapper {
    padding-left: 0;
    transition: all 0.5s ease;
    height: 100%;
}
#sidebar-wrapper {
    z-index: 1000;
  /*   position: fixed;
    top: 0;
    left: 0;
    width: 210px;
    height: calc(80vh - 6px); As you give a border of 3px
    overflow-y: auto;
    background: rgba(0,0,0,0.9);
    transition: all 0.5s ease; */
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border: 3px solid red;
    color:white;
}
.stories-preview-wrapper{
  position: fixed;
  height: calc(20vh - 6px); /* As you give a border of 3px */
  bottom: 0;
  left: 0;
  border: 3px solid green;
  width: 210px;
}
.sidebar-nav{
  overflow: auto;
}