body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background-color: #f0f0f0;
  padding: 20px;
  text-align: center;
}

h1 {
  margin: 0;
}

main {
  padding: 20px;
}

.categories {
  margin-bottom: 20px;
}

.categories ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.categories li {
  display: inline-block;
  margin-right: 20px;
}

.categories a {
  text-decoration: none;
  color: black;
}

.activities {
  margin-bottom: 20px;
}

.activities h2 {
  margin-top: 0;
}

.activity {
  display: inline-block;
  margin-right: 20px;
  padding: 10px;
  border: 1px solid #ccc;
  text-align: center;
}

.activity img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  margin-bottom: 5px;
}

footer {
  background-color: #f0f0f0;
  text-align: center;
  padding: 10px;
}