diff --git a/src/forms/form-select.scss b/src/forms/form-select.scss
index 5ad94c1267..712aeafb7f 100644
--- a/src/forms/form-select.scss
+++ b/src/forms/form-select.scss
@@ -7,10 +7,11 @@
   height: $size-5;
   padding-right: $spacer-4;
   background-color: var(--color-bg-primary);
-  background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAUCAMAAACzvE1FAAAADFBMVEUzMzMzMzMzMzMzMzMKAG/3AAAAA3RSTlMAf4C/aSLHAAAAPElEQVR42q3NMQ4AIAgEQTn//2cLdRKppSGzBYwzVXvznNWs8C58CiussPJj8h6NwgorrKRdTvuV9v16Afn0AYFOB7aYAAAAAElFTkSuQmCC");
+  // SVG with fill: #586069 (--color-icon-secondary)
+  background-image: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTYiIGhlaWdodD0iMTYiIHZpZXdCb3g9IjAgMCAxNiAxNiIgZmlsbD0iIzU4NjA2OSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJNNC40MjcgOS40MjdsMy4zOTYgMy4zOTZhLjI1MS4yNTEgMCAwMC4zNTQgMGwzLjM5Ni0zLjM5NkEuMjUuMjUgMCAwMDExLjM5NiA5SDQuNjA0YS4yNS4yNSAwIDAwLS4xNzcuNDI3ek00LjQyMyA2LjQ3TDcuODIgMy4wNzJhLjI1LjI1IDAgMDEuMzU0IDBMMTEuNTcgNi40N2EuMjUuMjUgMCAwMS0uMTc3LjQyN0g0LjZhLjI1LjI1IDAgMDEtLjE3Ny0uNDI3eiIgLz48L3N2Zz4=');
   background-repeat: no-repeat;
-  background-position: right 8px center;
-  background-size: 8px 10px;
+  background-position: right 4px center;
+  background-size: 16px;
   appearance: none;
 
   // Hides the default caret in IE11
@@ -23,6 +24,13 @@
   }
 }
 
+@include color-mode(dark) {
+  .form-select {
+    // SVG with fill: #6e7681 (--color-icon-secondary)
+    background-image: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTYiIGhlaWdodD0iMTYiIHZpZXdCb3g9IjAgMCAxNiAxNiIgZmlsbD0iIzZlNzY4MSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJNNC40MjcgOS40MjdsMy4zOTYgMy4zOTZhLjI1MS4yNTEgMCAwMC4zNTQgMGwzLjM5Ni0zLjM5NkEuMjUuMjUgMCAwMDExLjM5NiA5SDQuNjA0YS4yNS4yNSAwIDAwLS4xNzcuNDI3ek00LjQyMyA2LjQ3TDcuODIgMy4wNzJhLjI1LjI1IDAgMDEuMzU0IDBMMTEuNTcgNi40N2EuMjUuMjUgMCAwMS0uMTc3LjQyN0g0LjZhLjI1LjI1IDAgMDEtLjE3Ny0uNDI3eiIgLz48L3N2Zz4=');
+  }
+}
+
 .select-sm {
   height: $size-4;
   // stylelint-disable-next-line primer/spacing