.ch-img-1 {
  background-image: url("/20211130154427oe_/http://www.com.cuhk.edu.hk/images/index_images/index_image_1.png")
}
.ch-img-2 {
  background-image: url("/20211130154427oe_/http://www.com.cuhk.edu.hk/images/index_images/index_image_2.png")
}
.ch-img-3 {
  background-image: url("/20211130154427oe_/http://www.com.cuhk.edu.hk/images/index_images/index_image_3.png")
}
.ch-img-4 {
  background-image: url("/20211130154427oe_/http://www.com.cuhk.edu.hk/images/index_images/index_image_4.png")
}
.ch-img-5 {
  background-image: url("/20211130154427oe_/http://www.com.cuhk.edu.hk/images/index_images/index_image_5.png")
}
.ch-img-6 {
  background-image: url("/20211130154427oe_/http://www.com.cuhk.edu.hk/images/index_images/index_image_6.png")
}
.ch-img-7 {
  background-image: url("/20211130154427oe_/http://www.com.cuhk.edu.hk/images/index_images/index_image_7.png")
}
.ch-img-8 {
  background-image: url("/20211130154427oe_/http://www.com.cuhk.edu.hk/images/index_images/index_image_8.png")
}
.ch-img-9 {
  background-image: url("/20211130154427oe_/http://www.com.cuhk.edu.hk/images/index_images/index_image_9.png")
}
.ch-item {
  width: 100%;
  height: 100%;
  width: 285px;
  height: 190px;
  position: relative;
  cursor: default;
  -webkit-transition: all 0.4s ease-in-out;
  -moz-transition: all 0.4s ease-in-out;
  -o-transition: all 0.4s ease-in-out;
  -ms-transition: all 0.4s ease-in-out;
  transition: all 0.4s ease-in-out;
}
.ch-info {
  position: absolute;
  background: rgba(205, 25, 25, 0.7);
  width: inherit;
  height: inherit;
  opacity: 0;
  filter: alpha(opacity=0);
  -webkit-transition: all 0.4s ease-in-out;
  -moz-transition: all 0.4s ease-in-out;
  -o-transition: all 0.4s ease-in-out;
  -ms-transition: all 0.4s ease-in-out;
  transition: all 0.4s ease-in-out;
  -webkit-transform: scale(0);
  -moz-transform: scale(0);
  -o-transform: scale(0);
  -ms-transform: scale(0);
  transform: scale(0);
  -webkit-backface-visibility: hidden;
}
.ch-info p {
  color: #fff;
  margin-top: 70px;
  padding: 10px 5px;
  font-size: 16px;
  opacity: 0;
  filter: alpha(opacity=0);
  -webkit-transition: all 1s ease-in-out 0.4s;
  -moz-transition: all 1s ease-in-out 0.4s;
  -o-transition: all 1s ease-in-out 0.4s;
  -ms-transition: all 1s ease-in-out 0.4s;
  transition: all 1s ease-in-out 0.4s;
}
.ch-info a {
  color: white;
}
.ch-item:hover .ch-info {
  -webkit-transform: scale(1);
  -moz-transform: scale(1);
  -o-transform: scale(1);
  -ms-transform: scale(1);
  transform: scale(1);
  opacity: 1;
  filter: alpha(opacity=100);
  filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#b2CD1919,endColorstr=#b2CD1919); /*IE*/
  width:285px;
  height:190px;
}

.ch-item:hover .ch-info p {
  opacity: 1;
  filter: alpha(opacity=100);
}