.art-board{
  display: inline-block;
}
.thumbnail{
  float: left;
  padding-right: 0%;
  padding-bottom: 0%;
}
.img-thumb{
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 10rem;
}
.img-big{
  display: block;
  margin-left: auto;
  margin-right: auto;
  padding-bottom: 2%;
  width: 50%;
}
figure{
  width: 10rem;
}
figcaption{
  text-align:center;
}