dl#simple_gallery {
  width:100%;
  height:auto;
  position: relative;
}
dl#simple_gallery dt{
  width: 130px;
  position: sticky;
  float: left;
  margin-right: 10px;
  z-index: 1;
  opacity: .7;
}
dl#simple_gallery dt.last-child{
  margin-right: 0;
}
dl#simple_gallery dt img {   
width: 111px;
height: 111px;
cursor: pointer;
}
/*
dl#simple_gallery dt:hover + dd  { 
opacity:1;
z-index: 2;
}*/ 
dl#simple_gallery dt img:hover {
  outline: 5px solid blue;
  opacity: 1;
  z-index: 1;
}
dl#simple_gallery dd {
position: absolute;
top: 0;
margin: 0;
opacity: 0;
transition: .7s opacity;
}
dl#simple_gallery dd img {
  width: 100%;
  height: auto;
}
/* Create four equal columns that sits next to each other */
.col {
  padding: 10px 20px;
  margin-top: 100px;
  position: sticky;
  border: 5px solid #ff6c00;
  width: 25%;
}
.row {
  display: -ms-flexbox; /* IE10 */
  display: flex;
  -ms-flex-wrap: wrap; /* IE10 */
  flex-wrap: wrap;
  padding: 70px 4px;
}
.ServiceIcons{
  width: 80px;
  height: auto;
  padding-right: 20px;
  margin-bottom: 20px;
}

  /* Responsive layout - makes a two column-layout instead of four columns */
  @media only screen and (max-width:850px){
    .col {
      margin-top: 70px;
      width: auto;
    }
    .row {
      padding: 20px 4px;
  }
}