/* 头部banner */
.topBanner {
  height: 460px;
  background-image: url(../imgs/22.png);
}
/* 主体内容介绍文字 */
.tit {
  margin: 40px auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.tit p{
  letter-spacing: 4px;
}
.tit img {
  width: 32px;
  height: 32px;
  margin-top: 20px;
}
/* 活动图片部分 */
#partyBuilding {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  padding: 0;
  border: 0;
}
#partyBuilding .card {
  border: 0;
  margin: 0 20px 20px 0;
  width: 25%;
}
@media screen and (max-width: 570px) {
  #partyBuilding .card {
    border: 0;
    margin: 10px auto;
  }
}
#partyBuilding .card img {
  max-width: 100%;
  height: 100% !important; 
}