html {
  --red-token-color: brown;
  --yellow-token-color: yellow;
  --empty-cell-color: gray;
  --token-size: 50px;
  --board-color: rgba(10, 53, 220, 1);
}
body {
  background-color: white;
}

body header {
  text-align: center;
}

body main {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

body main [class*="token"] {
  height: var(--token-size);
  width: var(--token-size);
  border-radius: 50%;
  border: 4px inset rgba(10, 52, 220, 0.3);
}

#board {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  background-color: var(--board-color);
  border-radius: 20px;
  box-shadow: 5px 5px 29px 0px rgba(109, 109, 109, 0.8);
  height: 600px;
  width: 700px;
}
#board .row {
  display: flex;
  justify-content: space-around;
}

#board .column {
  background-color: var(--empty-cell-color);
  margin: 5px;
  box-shadow: inset 1px 1px 1px #000000a6;
}

body main .red-token, #board .column.red-token {
  background-color: var(--red-token-color);
}

body main .yellow-token, #board .column.yellow-token {
  background-color: var(--yellow-token-color);
}

#control-panel {
  width: 700px;
  display: flex;
  justify-content: space-around;
  margin: 20px 0;
}

#control-panel [class*="token"] {
  border-style: dashed;
}

#control-panel.current-plyer-is-red [class*="token"]:hover {
  background-color: var(--red-token-color);
}

#control-panel.current-plyer-is-yellow [class*="token"]:hover {
  background-color: var(--yellow-token-color);
}