* {
  box-sizing: border-box;
}

@media (prefers-color-scheme: dark) {
  * {
    background-color: #333;
  }
}

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

header {
  background-color: #333;
  color: white;
  padding: 20px;
  text-align: center;
}

@media (prefers-color-scheme: dark) {
  header {
    background-color: #121212;
    color: #f5f5f5;
  }
}

.text-in-header {
  background-color: #121212;
}

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

section {
  margin-bottom: 20px;
  text-align: center;
  width: 45%;
  max-width: 300px;
}

@media (prefers-color-scheme: dark) {
  section {
    /* background-color: #282828; */
    color:#f5f5f5;
    border-radius: 5px;
  }
}

h2 {
  margin-top: 0;
}

.btn {
  border: none;
  color: white;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin-top: 10px;
  cursor: pointer;
  border-radius: 5px;
}

.btn:hover {
  background-color: #999999;
}

.btn-win {
  background-color: #0078d7;
}

.btn-android {
  background-color: #3e8e41;
}

.btn-web {
  background-color: #FF5722;
}

.btn-linux {
  background-color: #f8981d;
}

.btn-unavailable {
  background-color: #999999;
}

footer {
  background-color: #333;
  color: white;
  padding: 10px;
  text-align: center;
}

@media (prefers-color-scheme: dark) {
  footer {
    background-color: #121212;
  }
}