.sub-header {
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}
.placeholders {
    margin-bottom: 30px;
    text-align: center;
}
.placeholders h4 {
    margin-bottom: 0;
}
.placeholder {
    padding: 3px;
}
.placeholder img {
    display: inline-block;
}

.selected {
  background-color: red;
}

  .placeholder:hover {
    border: 3px solid #337ab7;
    border-radius: 5px;
    cursor: pointer;
    padding: 0px;
    background-color:#f5f5f5;
  }