body {
  font-family: Arial, sans-serif;
  margin: 20px;
}

#board {
  display: flex;
  justify-content: space-around;
  position: relative;
  min-height: 500px;
}

.column {
  flex: 1;
  margin: 0 10px;
  padding: 10px;
  border: 1px solid #ccc;
  background: #f9f9f9;
}

.column h2 {
  text-align: center;
  margin-bottom: 10px;
}

.node {
  display: block;
  margin: 6px auto;
  padding: 8px;
  border: 1px solid #888;
  border-radius: 4px;
  text-align: center;
  color: #000;
  cursor: pointer; /* hosts clickable */
}

.node.host {
  font-weight: bold;
}

.node.unassigned {
  font-weight: bold;
  background: #ffe0e0 !important;
  border-color: #cc0000 !important;
}

#connections {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  pointer-events: none;
}