nav.pojmy {
  width: auto;
  height: 200px;
  overflow: none;
  overflow-y: scroll;
  float: none;
  padding: 0 12px 12px 12px;
  margin-bottom: 15px;
  border-bottom: 1px dotted #ccc;
}

section.pojem {
  width: auto;
  float: none;
  padding: 0 12px 12px 12px;
}

section.pojem article img {
  width: auto;
  max-width: 100%;
  float: none;
  margin-left: 0;
  margin-right: 0;
}