* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: Arial, sans-serif;
  background-color: #ffffff;
  color: #333;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  text-align: center;
}
main {
  flex: 1;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.logo {
  width: 280px;
  max-width: 100%;
  margin: 20px 0;
}
.intro {
  max-width: 600px;
  margin-bottom: 20px;
  background: #fff;
  padding: 15px;
  border: 1px solid #dcdcdc;
  box-shadow: 0 0 8px rgba(0,0,0,0.1);
}
.intro p {
  font-size: 16px;
  margin-bottom: 15px;
}
.btn {
  display: inline-block;
  padding: 10px 20px;
  font-size: 16px;
  background: #f2f2f2;
  border: 1px solid #dcdcdc;
  border-radius: 4px;
  text-decoration: none;
  color: #333;
  margin-bottom: 15px;
}
.btn:hover {
  background: #e6e6e6;
}
.youtube-subscribe {
  margin-top: 20px;
}
.youtube-subscribe p {
  font-size: 16px;
  margin-bottom: 10px;
}
footer {
  padding: 10px;
  background: #333;
  color: #ffffff;
  text-align: center;
}