.square-holder {
  padding:10px;
  border: 2px solid white;
  align-items: center;
  display:flex;
  align-items: center;
  justify-content: center;
  margin-bottom:20px;
  background-color:white ;
  min-height:150px;
}

.square-holder img {
  max-width:100%;
   
  transition: all 0.3s;
}

.square-holder:hover img{
  filter:none;
}