body{

margin:0;

background:#111827;

font-family:Arial,sans-serif;

color:white;

}

.container{

width:90%;

max-width:900px;

margin:auto;

padding:40px;

text-align:center;

}

.subtitle{

color:#bbb;

margin-bottom:40px;

}

.card{

background:#1f2937;

padding:25px;

margin:20px 0;

border-radius:15px;

box-shadow:0 5px 20px rgba(0,0,0,.4);

}

.card h2{

margin-top:0;

}

button{

padding:15px 40px;

font-size:18px;

background:#2563eb;

border:none;

border-radius:8px;

color:white;

cursor:pointer;

transition:.3s;

}

button:hover{

background:#1d4ed8;

}

.footer{

margin-top:50px;

color:#aaa;

}