body {
  background-color: rgb(97, 181, 255);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

#container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  height: 500px;
  width: 500px;
  border: 1px solid black;
  margin: 10px;
  margin-top: 90px;
}

h1 {
  font-weight: bold;
  font-size: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: black;
}

.row {
  background-color: gray;
  height: 2rem;
  width: 2rem;
  gap: 0.5px;
  border: 0.5px solid #ddd;
}

.column {
  background-color: white;
  gap: 0.5px;
  border: 0.5px solid #ddd;
  box-sizing: border-box;
}

button {
  display: flex;
  border-radius: 20px;
  padding: 12px;
  padding-left: 14px;
  padding-right: 14px;
  margin: 40px;
  font-size: medium;
  font-weight: 500;
}

button:hover {
  font-weight: 500;
  padding: 10px;
  font-size: medium;
  padding-left: 14px;
  padding-right: 14px;
  color: white;
  background-color: black;
  border-radius: 20px;
}

.row:hover {
  color: green;
  background-color: greenyellow;
}

.column:hover {
  color: green;
  background-color: greenyellow;
}
.container > div {
  border: 1px solid black;
  height: 25px;
  width: 25px;
}

.container > div:nth-child(16n + 1) {
  width: 100%;
  border: 0;
  height: 0;
}