body{
  margin:0;
  padding:0;
  background:#0f172a;
  color:white;
  font-family:Arial;
}

.container{
  width:90%;
  max-width:900px;
  margin:auto;
  padding:30px;
}

h1{
  text-align:center;
  margin-bottom:30px;
}

.upload-box{
  background:#1e293b;
  padding:20px;
  border-radius:15px;
  margin-bottom:20px;
}

label{
  display:block;
  margin-bottom:10px;
}

input{
  width:100%;
}

button{
  width:100%;
  padding:15px;
  border:none;
  border-radius:12px;
  background:#2563eb;
  color:white;
  font-size:18px;
  cursor:pointer;
  margin-top:15px;
}

button:hover{
  background:#1d4ed8;
}

.canvas-area{
  margin-top:30px;
  text-align:center;
}

canvas{
  max-width:100%;
  background:#111827;
  border-radius:15px;
}