ul.flex {
    
    display: flex;
    
    flex-direction: column;
    flex-wrap: nowrap;
    
    justify-content: flex-start;
    align-items: stretch;
  }
    
  ul.flex.row {
    
    flex-direction: row;
  }
  
  ul.flex.wrap {
    
    flex-wrap: wrap;
  }
    
  ul.flex.justifyCenter {
    
    justify-content: center;
  }
  
  ul.flex.alignCenter {
    
    align-items: center;
  }