body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header,
footer {
  background-color: #f8f8f8;
  padding: 20px;
}
.grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.grid-item {
  flex: 1 1 200px;
  text-align: center;
}