* { box-sizing: border-box; }
body {
  font-family: helvetica;
  font-weight: 300;
  background: #fbfbfb;
  font-size: 12px;
}
.dragging { cursor: -webkit-grabbing !important; }
.ui-sortable-helper { cursor: -webkit-grabbing !important; }

#controls {
  position: fixed;
  top: 0; right: 0;
  padding: 10px;
}
#lists {
  display: flex;
  flex-direction: row;
}
#lists h3 {
  margin: 0 0 5px 0;
  width: 40px;
  text-align: right;
  padding-right: 5px;
  white-space: pre;
}
.list span {
  display: inline-block;
  min-width: 40px;
  text-align: right;
  padding-right: 5px;
}
.list > div > div {
  padding-right: 10px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.list div div:nth-child(odd) {
  background-color: #eee;
}
.list div div:nth-child(even) {
  background-color: #fff;
}
.list div div {
  cursor: move;
  cursor: grab;
  cursor: -webkit-grab;
}
.list div div.pair:nth-child(even) {
  background-color: #444;
  color: #fff;
}
.list div div.pair:nth-child(odd) {
  background-color: #333;
  color: #fff;
}