diff --git a/src/Report/Html/Renderer/Template/css/style.css b/src/Report/Html/Renderer/Template/css/style.css
index c0a045889..4d46b38c0 100644
--- a/src/Report/Html/Renderer/Template/css/style.css
+++ b/src/Report/Html/Renderer/Template/css/style.css
@@ -1,13 +1,71 @@
+
 :root {
- --phpunit-breadcrumbs: var(--bs-gray-200);
- --phpunit-success-bar: #28a745;
- --phpunit-success-high: {{success-high}};
- --phpunit-success-medium: {{success-medium}};
- --phpunit-success-low: {{success-low}};
- --phpunit-warning: {{warning}};
- --phpunit-warning-bar: #ffc107;
- --phpunit-danger: {{danger}};
- --phpunit-danger-bar: #dc3545;
+    /* Implementing an auto-selection of dark/light theme via: https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/light-dark */
+    color-scheme: light dark;
+ 
+    /* PHPUnit ligh/dark colors */
+    --phpunit-breadcrumbs: light-dark(var(--bs-gray-200), var(--bs-gray-800));
+    --phpunit-success-bar: light-dark(#28a745 ,#1f8135);
+    --phpunit-success-high: light-dark(#99cb84, #3d5c4e);
+    --phpunit-success-medium: light-dark(#c3e3b5,#3c6051);
+    --phpunit-success-low: light-dark(#dff0d8, #2d4431);
+    --phpunit-warning: light-dark(#fcf8e3, #3e3408);
+    --phpunit-warning-bar: light-dark(#ffc107 ,#c19406);
+    --phpunit-danger: light-dark(#f2dede, #42221e);
+    --phpunit-danger-bar: light-dark(#dc3545, #a62633);
+
+    /* Bootstrap v5.3 default colors (ligth, dark) */
+    --bs-body-bg-rgb: light-dark((255, 255, 255), (33, 37, 41));
+    --bs-body-bg: light-dark(#fff, #212529);
+    --bs-body-color-rgb: light-dark(33, 37, 41, 222, 226, 230);
+    --bs-body-color: light-dark(#212529, #dee2e6);
+    --bs-border-color-translucent: light-dark(rgba(0, 0, 0, 0.175), rgba(255, 255, 255, 0.15));
+    --bs-border-color: light-dark(#dee2e6, #495057);
+    --bs-code-color: light-dark(#d63384, #e685b5);
+    --bs-danger-bg-subtle: light-dark(#f8d7da, #2c0b0e);
+    --bs-danger-border-subtle: light-dark(#f1aeb5, #842029);
+    --bs-danger-text-emphasis: light-dark(#58151c, #ea868f);
+    --bs-dark-bg-subtle: light-dark(#ced4da, #1a1d20);
+    --bs-dark-border-subtle: light-dark(#adb5bd, #343a40);
+    --bs-dark-text-emphasis: light-dark(#495057, #dee2e6);
+    --bs-emphasis-color-rgb: light-dark((0, 0, 0), (255, 255, 255));
+    --bs-emphasis-color: light-dark(#000, #fff);
+    --bs-form-invalid-border-color: light-dark(#dc3545, #ea868f);
+    --bs-form-invalid-color: light-dark(#dc3545, #ea868f);
+    --bs-form-valid-border-color: light-dark(#198754, #75b798);
+    --bs-form-valid-color: light-dark(#198754, #75b798);
+    --bs-highlight-bg: light-dark(#fff3cd, #664d03);
+    --bs-highlight-color: light-dark(#212529, #dee2e6);
+    --bs-info-bg-subtle: light-dark(#cff4fc, #032830);
+    --bs-info-border-subtle: light-dark(#9eeaf9, #087990);
+    --bs-info-text-emphasis: light-dark(#055160, #6edff6);
+    --bs-light-bg-subtle: light-dark(#fcfcfd, #343a40);
+    --bs-light-border-subtle: light-dark(#e9ecef, #495057);
+    --bs-light-text-emphasis: light-dark(#495057, #f8f9fa);
+    --bs-link-color-rgb: light-dark((13, 110, 253), (110, 168, 254));
+    --bs-link-color: light-dark(#0d6efd, #6ea8fe);
+    --bs-link-hover-color-rgb: light-dark((10, 88, 202), (139, 185, 254));
+    --bs-link-hover-color: light-dark(#0a58ca, #8bb9fe);
+    --bs-primary-bg-subtle: light-dark(#cfe2ff, #031633);
+    --bs-primary-border-subtle: light-dark(#9ec5fe, #084298);
+    --bs-primary-text-emphasis: light-dark(#052c65, #6ea8fe);
+    --bs-secondary-bg-rgb: light-dark((233, 236, 239), (52, 58, 64));
+    --bs-secondary-bg-subtle: light-dark(#e2e3e5, #161719);
+    --bs-secondary-bg: light-dark(#e9ecef, #343a40);
+    --bs-secondary-border-subtle: light-dark(#c4c8cb, #41464b);
+    --bs-secondary-color-rgb: light-dark((33, 37, 41), (222, 226, 230));
+    --bs-secondary-color: light-dark(rgba(33, 37, 41, 0.75), rgba(222, 226, 230, 0.75));
+    --bs-secondary-text-emphasis: light-dark(#2b2f32, #a7acb1);
+    --bs-success-bg-subtle: light-dark(#d1e7dd, #051b11);
+    --bs-success-border-subtle: light-dark(#a3cfbb, #0f5132);
+    --bs-success-text-emphasis: light-dark(#0a3622, #75b798);
+    --bs-tertiary-bg-rgb: light-dark(248, 249, 250, 43, 48, 53);
+    --bs-tertiary-bg: light-dark(#f8f9fa, #2b3035);
+    --bs-tertiary-color-rgb: light-dark((33, 37, 41), (222, 226, 230));
+    --bs-tertiary-color: light-dark(rgba(33, 37, 41, 0.5), rgba(222, 226, 230, 0.5));
+    --bs-warning-bg-subtle: light-dark(#fff3cd, #332701);
+    --bs-warning-border-subtle: light-dark(#ffe69c, #997404);
+    --bs-warning-text-emphasis: light-dark(#664d03, #ffda6a);
 }
 
 body {
@@ -198,4 +256,4 @@ table#code td:first-of-type a {
 
 .progress-bar.bg-danger {
  background-color: var(--phpunit-danger-bar) !important;
-}
\ No newline at end of file
+}