/* ---- grid-item ---- */
  .grid-sizer,
  .grid-item {
      width: 25%;
  }
  
  @media (max-width: 1250px) {
      .grid-sizer,
      .grid-item {
          width: 50%;
      }
  }
  
  @media (max-width: 480px) {
      .grid-sizer,
      .grid-item {
          width: 100%;
      }
  }
    
    .grid-item {
      float: left;
      border-radius: 5px;
    }