/* General layout */

body {
  background-color: white;
  display: flex;
  flex-direction: column-reverse;
  justify-content: center;
  align-items: center;
  margin: 0;
  min-height: 100vh;
}

/* Action buttons */

.actions {
  display: flex;
  flex-direction: row;
  justify-content: space-evenly;
  align-items: flex-end;
  width: 720px;
  height: 100px;
}

.action {
  color: darkgray;
  font-family: "Helvetica Neue", sans-serif;
  font-size: 20px;
  line-height: 20px;
  font-weight: 300;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  padding: 20px;
  width: 120px;
}

.action:hover {
  background-color: darkgray;
  color: white;
  font-weight: 700;
}

.action[href=""] {
  display: none;
}

/* Connect Four board */

.board {
  background-color: blue;
  display: flex;
  flex-direction: row;
  padding: 0 10px;
  position: relative;
}

.board::before,
.board::after {
  background-color: blue;
  content: "";
  height: 720px;
  width: 20px;
  position: absolute;
}

.board::before {
  left: -20px;
}

.board::after {
  right: -20px;
}

.column {
  display: flex;
  flex-direction: column-reverse;
  padding: 10px;
}

.cell {
  border-radius: 50%;
  width: 80px;
  height: 80px;
  margin: 10px 0;
}

.empty {
  background-color: white;
}

.column:hover .empty {
  background-color: lightgray;
}

.column:hover .empty ~ .empty {
  background-color: white;
}

.red {
  background-color: red;
}

.yellow {
  background-color: yellow;
}