style.css

:root {
  --background-color: rgb(20, 20, 20);
  --link-length: 3.5rem;
}

body {
  padding: 0;
  margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--background-color);
}

.game-board {
  margin-bottom: 5rem;
  display: flex;
  flex-direction: column;
  padding: 1rem;
  border: 2px solid rgba(255, 255, 255, 0.4);
}

.row {
  display: flex;
  justify-content: space-evenly;
  align-items: center;
}

.rowCon {
  margin: 0.4rem 0;
  display: flex;
  justify-content: space-evenly;
}

.col {
  width: 1rem;
  height: 1rem;
  background-color: red;
}

.empty {
  margin: 0 0.4rem;
  width: var(--link-length);
  height: 0.5rem;
}

.colCon {
  margin: 0 0.4rem;
  width: var(--link-length);
  height: 0.5rem;
}
.colRowCon {
  width: 0.5rem;
  height: var(--link-length);
}

.connectionInactive {
  background-color: var(--background-color);
}

.connectionActive {
  background-color: darkred;
}

.nodeActive {
  background-color: lightgreen;
}

.linkActive {
  background-color: aquamarine;
}

.score {
  color: rgba(255, 255, 255, 0.8);
  font-size: 4rem;
}

.reset-button {
  height: 5rem;
  width: 20rem;
  background-color: rgba(255, 255, 255, 0.6);
  font-size: x-large;
}

.next-level-button {
  height: 5rem;
  width: 20rem;
  background-color: rgba(255, 255, 255, 0.6);
  font-size: x-large;
}