body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
}

header {
  background-color: #5bc0de;
  color: white;
  text-align: center;
  padding: 20px;
}

header h1 {
  margin: 0;
}

nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
}

main {
  padding: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.app-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
}

.app-item {
  width: 300px;
  margin: 10px;
  background-color: white;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
  text-align: center;
  padding: 10px;
}

.app-item img {
  width: 100%;
  height: auto;
}

button {
  width: 100%;
  padding: 10px;
  background-color: #5bc0de;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background-color: #31b0d5;
}