--- a/devtools/server/actors/highlighters/flexbox.js
+++ b/devtools/server/actors/highlighters/flexbox.js
@@ -33,17 +33,16 @@ const FLEXBOX_LINES_PROPERTIES = {
     lineDash: [0, 0]
   }
 };
 
 const FLEXBOX_CONTAINER_PATTERN_WIDTH = 14; // px
 const FLEXBOX_CONTAINER_PATTERN_HEIGHT = 14; // px
 const FLEXBOX_CONTAINER_PATTERN_LINE_DISH = [5, 3]; // px
 const BASIS_FILL_COLOR = "rgb(109, 184, 255, 0.4)";
-const BASIS_EDGE_COLOR = "#6aabed";
 
 /**
  * Cached used by `FlexboxHighlighter.getFlexContainerPattern`.
  */
 const gCachedFlexboxPattern = new Map();
 
 const FLEXBOX = "flexbox";
 
@@ -318,19 +317,17 @@ class FlexboxHighlighter extends AutoRef
     if (basis.endsWith("px")) {
       right = left + parseFloat(basis);
     } else if (basis.endsWith("%")) {
       basis = parseFloat(basis) / 100 * boundsWidth;
       right = left + basis;
     }
 
     this.ctx.fillStyle = BASIS_FILL_COLOR;
-    this.ctx.strokeStyle = BASIS_EDGE_COLOR;
     drawRect(this.ctx, left, top, right, bottom, this.currentMatrix);
-    this.ctx.stroke();
     this.ctx.fill();
   }
 
   renderFlexItems() {
     if (!this.currentQuads.content || !this.currentQuads.content[0]) {
       return;
     }