.image { padding: 1em; }
.image img { padding: 0em 30px; }
.unknotting img { padding: 0em 10px }
.gallery {
  width:            660px;
  margin-left:      auto;
  margin-right:     auto;
  padding-top:      1em;
}
.captioned-image {
  display:          block;
  float:            left;
  margin:           0em;
  padding:          0em;
  width:            220px;
}
.caption  {
  margin-bottom:    0em;
  font-style:       italic;
}
.spacer {
  clear:            both;
}
#Klein-bottle {
  margin-bottom:    2em;
}