diff --git a/types/browser-bunyan/browser-bunyan-tests.ts b/types/browser-bunyan/browser-bunyan-tests.ts
index 6cf1bf926b..9dcb519c27 100644
--- a/types/browser-bunyan/browser-bunyan-tests.ts
+++ b/types/browser-bunyan/browser-bunyan-tests.ts
@@ -23,3 +23,19 @@ const myObject = { x: 1, y: 2 };
 log.info({ obj: myObject }, 'This is my object:');
 
 new bunyan.ConsoleFormattedStream({ logByLevel: true });
+
+const style = {
+    levels: {
+        trace: 'color: DeepPink',
+        debug: 'color: GoldenRod',
+        info: 'color: DarkTurquoise',
+        warn: 'color: Purple',
+        error: 'color: Crimson',
+        fatal: 'color: Black',
+    },
+    def: 'color: DimGray',
+    msg: 'color: SteelBlue',
+    src: 'color: DimGray; font-style: italic; font-size: 0.9em',
+};
+
+new bunyan.ConsoleFormattedStream({ css: style });
diff --git a/types/browser-bunyan/index.d.ts b/types/browser-bunyan/index.d.ts
index 4fedbcd780..24d4b3e874 100644
--- a/types/browser-bunyan/index.d.ts
+++ b/types/browser-bunyan/index.d.ts
@@ -10,17 +10,30 @@
 import * as bunyan from 'bunyan';
 
 declare namespace BrowserBunyan {
+    interface ConsoleFormattedStreamLevelStyle {
+        trace: string;
+        debug: string;
+        info: string;
+        warn: string;
+        error: string;
+        fatal: string;
+    }
+
+    interface ConsoleFormattedStreamStyle {
+        levels: Partial<ConsoleFormattedStreamLevelStyle>;
+        def: string;
+        msg: string;
+        src: string;
+    }
+
     interface ConsoleFormattedStreamOptions {
         logByLevel?: boolean;
+        css?: Partial<ConsoleFormattedStreamStyle>;
     }
 
-    interface ConsoleFormattedStream {
-        new(options?: ConsoleFormattedStreamOptions): NodeJS.WritableStream;
-    }
+    type ConsoleFormattedStream = new(options?: ConsoleFormattedStreamOptions) => NodeJS.WritableStream;
 
-    interface ConsoleRawStream {
-        new(options?: ConsoleFormattedStreamOptions): NodeJS.WritableStream;
-    }
+    type ConsoleRawStream = new(options?: ConsoleFormattedStreamOptions) => NodeJS.WritableStream;
 }
 
 type BrowserBunyan = typeof bunyan & {