Insert a Space After Price Change?

The plugin itself doesn’t actually style the results, but you could use something like the following:

.stock-tools {
  border: 3px solid #eee;
  padding: 20px;
}
.stock-tools .stock-tools-symbol {
  float: right;
}
.stock-tools .stock-tools-last {
  font-size: 48px;
  font-weight: bold;
  line-height: 48px;
}
.stock-tools.positive .stock-tools-change {
  color: #46a546;
}
.stock-tools.negative .stock-tools-change {
  color: #ff0000;
}
.stock-tools.no-change .stock-tools-change {
  color: #555;
}
.stock-tools .stock-tools-last-trade {
  color: #555;
  font-size: 11.9px;
}