first commit

connect4.css

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+/* 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;
+}