body {
  min-height: 100vh;
}

.message-pre {
  white-space: pre-wrap;
  word-break: break-word;
  background: #f8f9fa;
  border-radius: 1rem;
  padding: 1rem;
  margin: 0;
}

.email-html-frame {
  background: #fff;
  border: 1px solid #e9ecef;
  border-radius: 1rem;
  padding: 1rem;
  overflow-x: auto;
}

details summary.detail-toggle {
  list-style: none;
  cursor: pointer;
  display: inline-block;
  padding: 0.45rem 0.8rem;
  border: 1px solid #0d6efd;
  border-radius: 0.5rem;
  color: #0d6efd;
  font-size: 0.875rem;
  font-weight: 500;
  background: #fff;
}

details summary.detail-toggle::-webkit-details-marker {
  display: none;
}

details summary.detail-toggle::after {
  content: " ▼";
  font-size: 12px;
}

details[open] summary.detail-toggle::after {
  content: " ▲";
}