Note: Not duplicate of CSS center display inline block?
This is my fiddle:
body {
  max-width:400px;
}
.scroll {
  overflow: auto;
  white-space: nowrap;
}
.card {
display:inline-block;
width:240px;
 list-style-type:none;
}<section class="scroll">
      <ol>
       <li class="card">
        <a href="#">
     
     <img src="https://image.tmdb.org/t/p/w240_and_h266_bestv2/jYohlUVkLPFdnDryZ8V1HZkJzDt.jpg" />
     
     </a>
     
     <p class="castname"><a href="#">Aamir Khan</a></p>
     
    </li>
  
    
    <li class="card">
        <a href="#">
     
     <img src="https://image.tmdb.org/t/p/w240_and_h266_bestv2/jYohlUVkLPFdnDryZ8V1HZkJzDt.jpg"/>
     
     </a>
     
     <p class="castname"><a href="#">Aamir Khan</a></p>
     
    </li>
    
    <li class="card">
        <a href="#">
     
     <img src="https://image.tmdb.org/t/p/w240_and_h266_bestv2/jYohlUVkLPFdnDryZ8V1HZkJzDt.jpg"/>
     
     </a>
     
     <p class="castname"><a href="#">Aamir Khan</a></p>
     
    </li>
    
    <li class="card">
        <a href="#">
     
     <img src="https://image.tmdb.org/t/p/w240_and_h266_bestv2/jYohlUVkLPFdnDryZ8V1HZkJzDt.jpg"/>
     
     </a>
     
     <p class="castname"><a href="#">Aamir Khan</a></p>
     
    </li>
    
    <li class="card">
        <a href="#">
     
     <img src="https://image.tmdb.org/t/p/w240_and_h266_bestv2/jYohlUVkLPFdnDryZ8V1HZkJzDt.jpg"/>
     
     </a>
     
     <p class="castname"><a href="#">Aamir Khan</a></p>
     
    </li>
  
 
         </ol>
 
 
 </section>
  
  
  </div>I tried display:block;margin:auto in outer div.
I tried position:relative;left:50%;transform:translate(-50%)
I tried text-align:center;
But nothing seems to work. Is it even possible?
Thanks in advance guys :)
 
     
     
     
    