.expertise .banner {
  position: relative;
  height: 44.0625vw;
  min-height: 530px;
  overflow: hidden;
}
.expertise .banner .bg {
  width: 100%;
  height: auto;
  overflow: hidden;
}
.expertise .banner .mask {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -60%);
  width: 1040px;
}
.expertise .banner .mask .small_title {
  color: #06f;
  font-family: Montserrat-Bold;
  font-size: 12px;
  font-weight: 700;
  line-height: 130%;
  /* 15.6px */
  text-transform: uppercase;
}
.expertise .banner .mask .b_title {
  margin-top: 10px;
  color: #141516;
  font-family: Montserrat-Bold;
  font-size: 50px;
  line-height: 130%;
  /* 65px */
  text-transform: capitalize;
}
.expertise .banner .mask .b_title ._white {
  font-weight: 700;
}
.expertise .banner .mask .b_title ._blue {
  font-weight: 700;
}
.expertise .banner .mask .small_content {
  margin-top: 30px;
  width: 600px;
  color: #fff;
  font-family: Mulish;
  font-size: 16px;
  font-weight: 400;
  line-height: 24px;
  /* 150% */
  text-transform: capitalize;
}
.expertise .nine_wrap {
  width: 1040px;
  display: flex;
  flex-wrap: wrap;
  margin: 69px auto  160px;
}
.expertise .nine_wrap .nine_item {
  width: 332px;
  height: 220px;
  overflow: hidden;
  cursor: pointer;
  position: relative;
  margin-left: 22px;
  margin-bottom: 22px;
}
.expertise .nine_wrap .nine_item:nth-child(3n+1){
  margin-left: 0;
}
.expertise .nine_wrap .nine_item img {
  width: 100%;
  height: 100%;
  transition: transform 1s ease;
}
.expertise .nine_wrap .nine_item .mask {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 24px;
}
.expertise .nine_wrap .nine_item .mask .mask_text {
  color: #fff;
  font-family: Montserrat-Bold;
  font-size: 20px;
  font-weight: 700;
  line-height: 150%;
  /* 30px */
}
.expertise .nine_wrap .nine_item:hover img {
  transition: transform 1s ease-in-out;
  transform: scale(2);
}