Scrollable fixed sidebar

Scrollable fixed sidebar

HTML

<div class="nav-box">
  <div class="inner-box">
    <div class="tabs"><p>Navbar content Start</p></div>
    <div class="tabs"><p>Navbar content</p></div>
    <div class="tabs"><p>Navbar content</p></div>
    <div class="tabs"><p>Navbar content</p></div>
    <div class="tabs"><p>Navbar content</p></div>
    <div class="tabs"><p>Navbar content</p></div>
    <div class="tabs"><p>Navbar content</p></div>
    <div class="tabs"><p>Navbar content</p></div>
    <div class="tabs"><p>Navbar content</p></div>
    <div class="tabs"><p>Navbar content</p></div>
    <div class="tabs"><p>Navbar content</p></div>
    <div class="tabs"><p>Navbar content End</p></div>
    </div>
</div>
<div class="content-box">
  <p>Lorem Ipsum</p>
  <p>Lorem Ipsum</p>
  <p>Lorem Ipsum</p>
  <p>Lorem Ipsum</p>
  <p>Lorem Ipsum</p>
  <p>Lorem Ipsum</p>
  <p>Lorem Ipsum</p>
  <p>Lorem Ipsum</p>
  <p>Lorem Ipsum</p>
  <p>Lorem Ipsum</p>
  <p>Lorem Ipsum</p>
  <p>Lorem Ipsum</p>
</div>

CSS

.nav-box{
        position: fixed;
        border: 1px solid #0a2b1d;
       
   }
   .inner-box{
        width: 200px;
        height: 100%;
        overflow-y: scroll;
        border: 1px solid #0A246A;
    }
    .tabs{
        border: 3px solid chartreuse;
        color:darkred;
    }
    .content-box p{
      height:50px;
      text-align:center;
    }