diff --git a/web/ui/react-app/postcss.config.cjs b/web/ui/react-app/postcss.config.cjs
deleted file mode 100644
index bfba0ddfae..0000000000
--- a/web/ui/react-app/postcss.config.cjs
+++ /dev/null
@@ -1,14 +0,0 @@
-module.exports = {
-  plugins: {
-    'postcss-preset-mantine': {},
-    'postcss-simple-vars': {
-      variables: {
-        'mantine-breakpoint-xs': '36em',
-        'mantine-breakpoint-sm': '48em',
-        'mantine-breakpoint-md': '62em',
-        'mantine-breakpoint-lg': '75em',
-        'mantine-breakpoint-xl': '88em',
-      },
-    },
-  },
-};
diff --git a/web/ui/react-app/src/images/prometheus_logo_grey.svg.orig b/web/ui/react-app/src/images/prometheus_logo_grey.svg.orig
deleted file mode 100644
index b914095ecf..0000000000
--- a/web/ui/react-app/src/images/prometheus_logo_grey.svg.orig
+++ /dev/null
@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Generator: Adobe Illustrator 16.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
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-<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
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-<g id="Layer_2">
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diff --git a/web/ui/react-app/src/images/prometheus_logo_grey.svg.rej b/web/ui/react-app/src/images/prometheus_logo_grey.svg.rej
deleted file mode 100644
index 957b7dd1ef..0000000000
--- a/web/ui/react-app/src/images/prometheus_logo_grey.svg.rej
+++ /dev/null
@@ -1,11 +0,0 @@
---- web/ui/react-app/src/images/prometheus_logo_grey.svg
-+++ web/ui/react-app/src/images/prometheus_logo_grey.svg
-@@ -6,14 +6,8 @@
- <g id="Layer_2">
- </g>
- <g>
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