@charset "utf-8";
.row .col-md-6 .col-md-12{
  position: relative;
 width:auto
}
.image {
  opacity: 1
  display: block;
  transition: .5s ease;/* 轉場 */
  backface-visibility: hidden;
}

.col-md-6:hover .image {
  opacity: 0.5;
}
.col-md-12:hover .image {
  opacity: 0.3;
}