add xmr logo

desktop/src/main/java/haveno/desktop/images.css

@@ -55,6 +55,10 @@
     -fx-image: url("../../images/sell_red.png");
 }
 
+#image-xmr-logo {
+    -fx-image: url("../../images/xmr_logo.png");
+}
+
 #image-lock2x {
     -fx-image: url("../../images/lock@2x.png");
 }

desktop/src/main/java/haveno/desktop/main/market/offerbook/OfferBookChartView.java

@@ -65,6 +65,7 @@ import javafx.scene.chart.NumberAxis;
 import javafx.scene.chart.XYChart;
 import javafx.scene.control.Button;
 import javafx.scene.control.ComboBox;
+import javafx.scene.control.ContentDisplay;
 import javafx.scene.control.Label;
 import javafx.scene.control.SingleSelectionModel;
 import javafx.scene.control.Tab;
@@ -636,7 +637,11 @@ public class OfferBookChartView extends ActivatableViewAndModel<VBox, OfferBookC
 
         AutoTooltipButton button = new AutoTooltipButton();
         ImageView iconView = new ImageView();
-        iconView.setId(isSellOffer ? "image-buy-white" : "image-sell-white");
+        iconView.setId("image-xmr-logo");
+        iconView.setFitHeight(24);
+        iconView.setFitWidth(24);
+        iconView.setSmooth(true);
+        button.setContentDisplay(ContentDisplay.RIGHT);
         button.setGraphic(iconView);
         button.setGraphicTextGap(10);
         button.updateText(isSellOffer ? Res.get("market.offerBook.buy") : Res.get("market.offerBook.sell"));

desktop/src/main/java/haveno/desktop/main/offer/offerbook/OfferBookView.java

@@ -587,7 +587,10 @@ abstract public class OfferBookView<R extends GridPane, M extends OfferBookViewM
         model.initWithDirection(direction);
         ImageView iconView = new ImageView();
         createOfferButton.setGraphic(iconView);
-        iconView.setId(direction == OfferDirection.SELL ? "image-sell-white" : "image-buy-white");
+        createOfferButton.setContentDisplay(ContentDisplay.RIGHT);
+        iconView.setId("image-xmr-logo");
+        iconView.setFitHeight(24);
+        iconView.setFitWidth(24);
         createOfferButton.setId(direction == OfferDirection.SELL ? "sell-button-big" : "buy-button-big");
         avatarColumn.setTitle(direction == OfferDirection.SELL ? Res.get("shared.buyerUpperCase") : Res.get("shared.sellerUpperCase"));
         if (direction == OfferDirection.SELL) {