body{
font-family:Arial,Helvetica,sans-serif;
background:#fff;
margin:0;
padding:0;
text-align:center;
}

.container{
max-width:500px;
margin:auto;
padding:40px 20px;
}

h1{
font-size:32px;
margin-bottom:10px;
}

p{
color:#555;
margin-bottom:30px;
}

button{
width:100%;
padding:18px;
font-size:18px;
border:none;
background:#111;
color:white;
border-radius:8px;
margin-top:15px;
cursor:pointer;
}

button:hover{
opacity:0.9;
}

#preview img{
margin-top:20px;
max-width:100%;
border-radius:8px;
}