body{
  font-family:Arial,sans-serif;
  background:#f4f4f4;
  margin:0;
  padding:20px;
}

.wrap{
  display:grid;
  grid-template-columns:380px 1fr;
  gap:20px;
}

.controls{
  background:#fff;
  padding:18px;
  border-radius:12px;
  box-shadow:0 3px 12px rgba(0,0,0,.15);
}

.credit{
  font-size:12px;
  line-height:1.35;
  color:#666;
  margin:4px 0 18px;
  border-left:3px solid #ccc;
  padding-left:10px;
}

label{
  display:block;
  margin-top:12px;
  font-weight:bold;
}

input,select{
  width:100%;
  font-size:18px;
  padding:6px;
  box-sizing:border-box;
}

input[type="range"]{
  padding:0;
}

button{
  margin-top:18px;
  width:100%;
  padding:12px;
  font-size:18px;
  cursor:pointer;
}

.stage{
  background:#fff;
  padding:12px;
  border-radius:12px;
}

svg{
  width:900px;
  height:900px;
  background:#111;
  border:1px solid #ccc;
  touch-action:none;
}

.small{
  font-size:13px;
  color:#555;
  margin-top:4px;
}

@media (max-width: 900px){

  body{
    padding:10px;
  }

  .wrap{
    display:block;
  }

  .controls{
    margin-bottom:14px;
  }

  .stage{
    padding:6px;
    overflow-x:auto;
  }

  svg{
    width:100%;
    height:auto;
    max-width:900px;
    display:block;
  }
}