body{
  margin:0;
  font-family:Arial, sans-serif;
  background:#070a12;
  color:#fff;
}
.container{
  width:90%;
  margin:auto;
}
.nav{
  background:#0b1020;
  padding:20px 0;
}
.hero{
  padding:40px 0;
}
.btn{
  padding:12px 20px;
  background:#28d17c;
  border:none;
  border-radius:8px;
  color:#000;
  font-weight:bold;
  cursor:pointer;
}
.card{
  background:#121a2a;
  padding:20px;
  margin:10px 0;
  border-radius:12px;
}
.footer{
  text-align:center;
  padding:20px;
  color:#aaa;
}