数字と上線

HTML

<h2 class="heading" data-number="01">採用情報について</h2>

CSS

.heading {
  position: relative;
  padding-top: 10px;
  font-size: 26px;
  background-image: linear-gradient(90deg, #e5c046 0%, #e5c046 30%, rgba(0 0 0 / 0) 30%, rgba(0 0 0 / 0) 100%);
  background-size: 100% 1px;
  background-repeat: no-repeat;
  background-position: left top;
}

.heading::before {
  content: attr(data-number);
  display: block;
  margin-bottom: 20px;
  color: #e5c046;
  font-size: 26px;
  font-weight: 800;
}