* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: #000;
  color: #fff;
  font-family: Arial, sans-serif;
}

.container {
  max-width: 420px;
  margin: 0 auto;
  padding: 20px 15px;
  text-align: center;
}

.banner {
  width: 100%;
  border-radius: 10px;
  margin-bottom: 20px;
}

.btn {
  display: block;
  width: 100%;
  margin: 15px 0;
  padding: 22px 10px;
  background: linear-gradient(90deg, #001428, #0099c9, #001428);
  color: #fff;
  text-decoration: none;
  font-size: 18px;
  font-weight: bold;
  letter-spacing: 3px;
  border-radius: 6px;
  box-shadow: 0 0 15px #00c8ff;
}

.btn:hover {
  background: linear-gradient(90deg, #00335c, #00c8ff, #00335c);
}

.logo-box {
  border: 2px solid #003cff;
  border-radius: 12px;
  padding: 15px;
  margin-top: 20px;
}

.logo-box img {
  width: 100%;
}

footer {
  margin-top: 20px;
  font-size: 12px;
  color: #ffffff;
}