body {
  padding-top: 60px;
}

/* .nav-link.active {
  color: #007bff !important;
  font-weight: bold;
} */

#about {
  background-image: url('http://aflive.qiniu.huangmeimi.com/upic_1734488918216');
  background-size: cover;
  background-position: top center;
  background-repeat: no-repeat;
  position: relative;
  height: 500px;
  color: #ffffff;
}

/* 添加半透明遮罩层 */
#about::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  /* 黑色半透明遮罩 */
  z-index: 1;
}

/* 确保文字内容在遮罩层之上 */
#about .container {
  position: relative;
  z-index: 2;
}