.attr-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.attr {
  margin: 14px 5px;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 11px;
  border: 1px solid #eee;
}
.attr:hover {
  background: #c9c5c5;
}
.attr.checked {
    background: transparent;
    box-shadow: inset 0 0 0 1px #A6CE39;
    -webkit-box-shadow: inset 0 0 0 1px #A6CE39;
    -moz-box-shadow: inset 0 0 0 1px #A6CE39;
}