見出し背景に帯＋左アイコン

<h2 class="heading-block">
  <span class="icon">📌</span> よくある質問
</h2>

.heading-block {
  background: #f3f4f6;
  color: #1f2937;
  font-size: 18px;
  font-weight: 600;
  padding: 12px 16px;
  border-left: 6px solid #10b981;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.heading-block .icon {
  font-size: 18px;
}