fix font center issue on high resolution

src/js/net/minecraft/client/gui/widgets/GuiButton.js

@@ -16,7 +16,7 @@ window.GuiButton = class extends Gui {
     render(stack, mouseX, mouseY, partialTicks) {
         let mouseOver = this.isMouseOver(mouseX, mouseY);
         this.drawSprite(stack, GuiButton.textureGui, 0, 66 + (mouseOver ? 20 : 0), 200, 20, this.x, this.y, this.width, this.height);
-        this.drawCenteredString(stack, this.string, this.x + this.width / 2, this.y + this.height / 2 - 5);
+        this.drawCenteredString(stack, this.string, this.x + this.width / 2, this.y + this.height / 2 - 4);
     }
 
     onPress() {

src/js/net/minecraft/client/render/gui/FontRenderer.js

@@ -83,7 +83,7 @@ window.FontRenderer = class {
                 this.texture,
                 textureOffsetX, textureOffsetY,
                 FontRenderer.FIELD_SIZE, FontRenderer.FIELD_SIZE,
-                x, y,
+                Math.floor(x), Math.floor(y),
                 FontRenderer.FIELD_SIZE, FontRenderer.FIELD_SIZE
             );