main > .main-div > .main-content {
  margin-bottom: 20px;
  height: 500px;
  position: relative;
}
main > .main-div > .main-content > .seek-img {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  line-height: 500px;
  color: #bebebe;
  font-size: 30px;
  vertical-align: middle;
  display: table-cell;
}
main > .main-div > .main-content > .seek-img img {
  display: inline-block;
  vertical-align: middle;
  height: 50px;
}