diff --git a/src/stylesheet/adwaita-stylesheet.gresources.xml b/src/stylesheet/adwaita-stylesheet.gresources.xml
index feb16bdf646ae389ef5ca780cd393a51955d3bd0..786faba82a0473f95d91cbb1ea55320e4141ff6b 100644
--- a/src/stylesheet/adwaita-stylesheet.gresources.xml
+++ b/src/stylesheet/adwaita-stylesheet.gresources.xml
@@ -39,5 +39,6 @@
     <file>assets/bullet-symbolic.svg</file>
     <file>assets/check-symbolic.svg</file>
     <file>assets/dash-symbolic.svg</file>
+    <file>assets/devel-symbolic.svg</file>
   </gresource>
 </gresources>
diff --git a/src/stylesheet/assets/devel-symbolic.svg b/src/stylesheet/assets/devel-symbolic.svg
new file mode 100644
index 0000000000000000000000000000000000000000..24f1e20ae87a5df78891b53816faab6b973ad848
--- /dev/null
+++ b/src/stylesheet/assets/devel-symbolic.svg
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   viewBox="0 0 47 47"
+   version="1.1"
+   id="svg8"
+   sodipodi:docname="devel-symbolic.svg"
+   inkscape:version="1.1 (c68e22c387, 2021-05-23)"
+   width="47"
+   height="47"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs12" />
+  <sodipodi:namedview
+     id="namedview10"
+     pagecolor="#505050"
+     bordercolor="#ffffff"
+     borderopacity="1"
+     inkscape:pageshadow="0"
+     inkscape:pageopacity="0"
+     inkscape:pagecheckerboard="1"
+     showgrid="false"
+     inkscape:current-layer="svg8"
+     inkscape:zoom="17.230629"
+     inkscape:cx="58.471458"
+     inkscape:cy="37.143159" />
+  <path
+     style="fill:#000000;fill-opacity:1;stroke-width:3.00001;stroke-linecap:round;stop-color:#000000"
+     d="M 11.75,0 H 23.5 L 1e-7,47 22.94775,0.734375 -0.3642499,47 22.580562,0.734375 -0.7343749,47 22.213375,0.734375 -1.0986249,47 21.846187,0.734375 -1.4687499,47 21.479,0.734375 -1.8329999,47 21.111812,0.734375 -2.2031249,47 20.744625,0.734375 -2.5673749,47 20.377437,0.734375 -2.9374999,47 20.01025,0.734375 -3.3017499,47 19.643062,0.734375 -3.6718749,47 19.275875,0.734375 -4.0361249,47 18.908687,0.734375 -4.4062499,47 18.5415,0.734375 -4.7704999,47 18.174312,0.734375 -5.1406249,47 17.807125,0.734375 -5.5048749,47 17.439937,0.734375 -5.8749999,47 17.07275,0.734375 -6.2421874,47 16.705562,0.734375 -6.6093749,47 16.338375,0.734375 -6.9765624,47 15.971187,0.734375 -7.3437499,47 15.604,0.734375 -7.7109374,47 15.236812,0.734375 -8.0781249,47 14.869625,0.734375 -8.4453124,47 14.502437,0.734375 -8.8124999,47 14.13525,0.734375 -9.179687,47 13.768062,0.734375 -9.546875,47 13.400875,0.734375 -9.914062,47 13.033687,0.734375 -10.28125,47 12.6665,0.734375 -10.6455,47 12.299312,0.734375 -11.015625,47 11.932125,0.734375 -11.379875,47 11.564937,0.734375 -11.75,47 Z m 23.5,0 H 47 L 23.5,47 46.44775,0.734375 23.13575,47 46.080562,0.734375 22.765625,47 45.713375,0.734375 22.401375,47 45.346187,0.734375 22.03125,47 44.979,0.734375 21.667,47 44.611812,0.734375 21.296875,47 44.244625,0.734375 20.932625,47 43.877437,0.734375 20.5625,47 43.51025,0.734375 20.19825,47 43.143062,0.734375 19.828125,47 42.775875,0.734375 19.463875,47 42.408687,0.734375 19.09375,47 42.0415,0.734375 18.7295,47 41.674312,0.734375 18.359375,47 41.307125,0.734375 17.995125,47 40.939937,0.734375 17.625,47 40.57275,0.734375 17.26075,47 40.205562,0.734375 16.890625,47 39.838375,0.734375 16.526375,47 39.471187,0.734375 16.15625,47 39.104,0.734375 15.792,47 38.736812,0.734375 15.421875,47 38.369625,0.734375 15.057625,47 38.002437,0.734375 14.6875,47 37.63525,0.734375 14.32325,47 37.268062,0.734375 13.953125,47 36.900875,0.734375 13.588875,47 36.533687,0.734375 13.21875,47 36.1665,0.734375 12.8545,47 35.799312,0.734375 12.484375,47 35.432125,0.734375 12.120125,47 35.064937,0.734375 11.75,47 Z"
+     id="path2"
+     sodipodi:nodetypes="cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc" />
+  <g
+     id="b"
+     style="fill:#000000;fill-opacity:1;stroke-width:0.340426"
+     transform="matrix(2.9375,0,0,2.9375,47,0)">
+    <path
+       style="fill:#000000;fill-opacity:1;stroke-width:1.02128;stroke-linecap:round;stop-color:#000000"
+       d="M 0,0 H 4 V 16 L 3.937,0.25 3.876,16 3.812,0.25 3.75,16 3.687,0.25 3.626,16 3.562,0.25 3.5,16 3.437,0.25 3.376,16 3.312,0.25 3.25,16 3.187,0.25 3.126,16 3.062,0.25 3,16 2.937,0.25 2.876,16 2.812,0.25 2.75,16 2.687,0.25 2.626,16 2.562,0.25 2.5,16 2.437,0.25 2.376,16 2.312,0.25 2.25,16 2.187,0.25 2.126,16 2.062,0.25 2,16 1.937,0.25 1.875,16 1.812,0.25 1.75,16 1.687,0.25 1.625,16 1.562,0.25 1.5,16 1.437,0.25 1.375,16 1.312,0.25 1.25,16 1.187,0.25 1.125,16 1.062,0.25 1,16 0.937,0.25 0.875,16 0.812,0.25 0.75,16 0.687,0.25 0.625,16 0.562,0.25 0.5,16 0.437,0.25 0.376,16 0.312,0.25 0.25,16 0.187,0.25 0.126,16 0.062,0.25 0,16 Z"
+       transform="matrix(1,0,-0.5,1,4,0)"
+       id="path922"
+       sodipodi:nodetypes="cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc" />
+  </g>
+</svg>
diff --git a/src/stylesheet/widgets/_header-bar.scss b/src/stylesheet/widgets/_header-bar.scss
index 29e2c999993554bdd64014036f0c26cc3becc5b9..40adc109e7fe02f41b0a25dee535856631c74ba4 100644
--- a/src/stylesheet/widgets/_header-bar.scss
+++ b/src/stylesheet/widgets/_header-bar.scss
@@ -136,6 +136,8 @@ windowtitle {
 
 window.devel {
   headerbar > windowhandle {
-    background: cross-fade(8% -gtk-icontheme("system-run-symbolic"), image(transparent)) 90% 0/256px 256px no-repeat;
+    background-image: cross-fade(8% -gtk-recolor(url("assets/devel-symbolic.svg")),
+                                 image(transparent));
+    background-repeat: repeat-x;
   }
 }