body{
font-family:Arial;
background:#f5f5f5;
}

.container{
width:700px;
margin:auto;
background:white;
padding:20px;
}

#preview{
display:grid;
grid-template-columns:repeat(3,1fr);
gap:10px;
margin-top:20px;
}

canvas{
border:1px solid #ddd;
width:100%;
}