[DevTools] Bring back websocket message viewer colors

Screenshots: https://imgur.com/a/7rqmXSI
Bug: 996208
Change-Id: Id2beed57157772d28c98d87c6a88dfb88eca2d46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764126
Reviewed-by: Erik Luo <[email protected]>
Commit-Queue: Joey Arhar <[email protected]>
Cr-Original-Commit-Position: refs/heads/master@{#689311}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 4feb20a7164061fe74f223f3ec597781945cbec5
diff --git a/front_end/network/webSocketFrameView.css b/front_end/network/webSocketFrameView.css
index ec662ef..257a625 100644
--- a/front_end/network/webSocketFrameView.css
+++ b/front_end/network/webSocketFrameView.css
@@ -17,6 +17,10 @@
     background-image: none;
 }
 
+.websocket-frame-view-td {
+    border-bottom: 1px solid #ccc;
+}
+
 .websocket-frame-view .data-grid tr.selected {
     background-color: #def;
 }
@@ -43,7 +47,12 @@
     color: white;
 }
 
+.websocket-frame-view-row-send {
+    background-color: rgb(226, 247, 218);
+}
+
 .websocket-frame-view-row-error {
+    background-color: rgb(255, 237, 237);
     color: rgb(182, 0, 0);
 }