body {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 16px;
  margin-bottom: 16px;
}

.grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 1100px;
  width: 100%;
  margin: 12px;
}

.grid > fieldset {
  flex: 1 1 45%;
  min-width: 280px;
  box-sizing: border-box;
  margin-right: 4px;
  margin-left: 4px;
}

@media (max-width: 600px) {
  .grid > fieldset {
    flex-basis: 100%;
  }
}

fieldset {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 12px;
}

legend {
  padding: 0 6px;
}

label {
  display: block;
  font-size: .9rem;
  margin: 6px 0 4px;
}

input[type="text"],
textarea,
select {
  width: 100%;
}

textarea {
  resize: vertical;
  min-height: 58px;
}

canvas {
  max-width: 100%;
  border: 1px solid #ddd;
  border-radius: 8px;
  display: block;
  margin: 12px;
}

.row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.hint {
  color: #666;
  font-size: .85rem;
  margin-top: 12px;
}

h2,
h4 {
  margin: 4px 0;
  text-align: center;
}