body{
  margin:0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg,#0f172a,#020617);
  color:white;
}

header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:20px 40px;
}

button{
  padding:8px 15px;
  border:none;
  border-radius:8px;
  background:linear-gradient(90deg,#00d4ff,#6f00ff);
  color:#001;
  font-weight:bold;
  cursor:pointer;
}

button:hover{
  opacity:0.8;
}

.container{
  padding:20px 40px;
}

.card{
  background:#1e293b;
  padding:15px;
  margin:10px;
  border-radius:10px;
  display:inline-block;
  width:220px;
}