#content-gallery {
  font-family: "Helvetica", Sans Serif, sans-serif;
  font-size: small;
}

#content-gallery table {
  margin: auto;
}

#content-gallery th {
  padding: 1em 0 1em 0;

  vertical-align: middle;
  text-align: center;

  font-size: xx-large;
}

#content-gallery td {
  width: 160px;
  height: 160px;

  vertical-align: middle;
  text-align: center;
  color: whitesmoke;
}

#content-gallery img {
  margin: 1px;
  border: 1px solid lightgrey;
}

#content-gallery img:hover {
  margin: 0;
  border: 2px solid white;
}