select:required:invalid {
  color: gray;
}
option[value=""][disabled] {
  display: none;
}
option {
  color: black;
}

.collection {
  list-style: none;
  margin-left: 0;
  padding-left: 0;
}

.collection-data {
  margin-bottom: 20px;
}

.collection-color {
  display: inline-block;
  width: 0.5em;
  height: 1.5em;
  margin-right: 3px;
  float: left;
}

.collection-li-item {
  display: inline-block;
  padding-right: 10px;
}