diff --git a/gui/_groupbox.scss b/gui/_groupbox.scss
index a4193b2..ffa1468 100644
--- a/gui/_groupbox.scss
+++ b/gui/_groupbox.scss
@@ -3,8 +3,7 @@
 \*-------------------------------------------*/
 
 fieldset {
-    border: none;
-    box-shadow: var(--border-sunken-outer), var(--border-raised-inner);
+    border-image: svg-load("./icon/groupbox-border.svg") 2;
     padding: calc(2 * var(--border-width) + var(--element-spacing));
     padding-block-start: var(--element-spacing);
     margin: 0;
diff --git a/gui/icon/groupbox-border.svg b/gui/icon/groupbox-border.svg
new file mode 100644
index 0000000..38a6221
--- /dev/null
+++ b/gui/icon/groupbox-border.svg
@@ -0,0 +1,4 @@
+<svg width="5" height="5" viewBox="0 0 5 5" fill="grey" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M0 0H5V5H0V2H2V3H3V2H0" fill="white" />
+<path fill-rule="evenodd" clip-rule="evenodd" d="M0 0H4V4H0V1H1V3H3V1H0" fill="#808080" />
+</svg>