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

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

header{
height:100vh;
background:#0f172a;
color:white;

display:flex;
flex-direction:column;
justify-content:center;
align-items:center;
text-align:center;
}

header h1{
font-size:60px;
margin-bottom:20px;
}

header p{
font-size:24px;
margin-bottom:30px;
}

.btn{
background:#3b82f6;
padding:15px 30px;
text-decoration:none;
color:white;
border-radius:8px;
}

section{
padding:60px 20px;
text-align:center;
}

.card{
background:#f4f4f4;
padding:20px;
margin:15px auto;
max-width:400px;
border-radius:10px;
}