--- a/devtools/client/themes/memory.css
+++ b/devtools/client/themes/memory.css
@@ -596,17 +596,17 @@ html, body, #app, #memory-tool {
 }
 
 /**
  * Dagre-D3 graphs
  */
 
 svg {
   --arrow-color: var(--theme-splitter-color);
-  --text-color: var(--theme-body-color-alt);
+  --text-color: var(--theme-body-color);
 }
 
 .theme-dark svg {
   --arrow-color: var(--theme-body-color-alt);
 }
 
 svg #arrowhead {
   /* !important is needed to override inline style */

--- a/devtools/client/themes/webaudioeditor.css
+++ b/devtools/client/themes/webaudioeditor.css
@@ -16,27 +16,28 @@
   font-size: 110%;
 }
 
 /* Context Graph */
 svg {
   overflow: hidden;
   -moz-box-flex: 1;
   --arrow-color: var(--theme-splitter-color);
-  --text-color: var(--theme-body-color-alt);
+  --text-color: var(--theme-body-color);
 }
 
 .theme-dark svg {
   --arrow-color: var(--theme-body-color-alt);
 }
 
 /* Edges in graph */
 .edgePath path {
   stroke-width: 1px;
   stroke: var(--arrow-color);
+  fill: none;
 }
 svg #arrowhead {
   /* !important is needed to override inline style */
   fill: var(--arrow-color) !important;
 }
 
 /* AudioParam connection edges */
 g.edgePath.param-connection path {