.row {
  display: -ms-flexbox; /* IE10 */
  display: flex;
  -ms-flex-wrap: wrap; /* IE10 */
  flex-wrap: wrap;
  padding: 0 4px;
}

/* Create four equal columns that sits next to each other */
.column {
  -ms-flex: 25%; /* IE10 */
  flex: 25%;
  max-width: 25%;
  padding: 0 4px;
}

.column img {
  margin-top: 8px;
  vertical-align: middle;
  width: 100%;
  border-radius: 0%;
}


.books-box {
    display: grid;
    grid-template-columns: repeat(auto-fill,minmax(20%, 1fr));
    margin-left: 5%;
    margin-right: 5%;
}

.books-box img {
  border-radius: 0%;
  height: 90%;
  width: 90%;
}

/* Responsive layout - makes a two column-layout instead of four columns */
@media screen and (max-width: 800px) {
  .books-box {
      grid-template-columns: repeat(auto-fill,minmax(25%, 1fr));
  }
}

/* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 600px) {
  .books-box {
      grid-template-columns: repeat(auto-fill,minmax(50%, 1fr));
  }