.outer{
    overflow-y: auto;
    height:300px;
   width: 100%;
       
       

    }

.outer table{
    width: 100%;
    table-layout: fixed; 
 
  
    
}

.outer table th {
       
        top:0;
        position: sticky;
  
        
}

.derecho{

   text-align: right;
    

}

.izquierda{

    text-align:left;
}