Common CSS issues

scroll.php

<?php 

// Content jumping when scroll bar is introduced
<div class="outer-wrapper">
  <div class="inner-wrapper">
    <div>
     // Contents that affects overflow here
    </div>
  </div>
</div>
  
  
//Set the desired height to the outer wrapper and the desired width to the inner one.
//Display the outer wrapper as an inline-block, in order to make it shrink to the size of its content.
//Hide the overflow on the outer wrapper. Use overflow-y: auto

#outer-wrapper {
  height: 150px;
  overflow: hidden;
  display: inline-block; 
  overflow-y:auto
}
#inner-wrapperv {
  width: 200px;