diff --git a/admin/scss/themes/_grayscale.scss b/admin/scss/themes/_grayscale.scss
deleted file mode 100644
index 54817b216..000000000
--- a/admin/scss/themes/_grayscale.scss
+++ /dev/null
@@ -1,49 +0,0 @@
-/**
- * Sample alternative theme without colors (grayscale only).
- */
-
-/** -----------------------------------------------
- * Colours
- * ------------------------------------------------ */
-$color-base: grayscale(#b0bec7);
-
-$color-widget-bg: grayscale(lighten($color-base, 20%));
-
-$color-dark-bg: grayscale(#003050);
-$color-dark-separator: grayscale(#19435c);
-
-$color-shadow-light: grayscale(rgba(201, 205, 206, 0.8));
-$color-shadow-dark: grayscale(rgba(107, 120, 123, 0.5));
-
-$color-highlight: grayscale(#FFFF66);
-
-$color-menu-button: grayscale(#338DC1);
-$color-menu-background: grayscale(#c6d7df);
-$color-menu-border: grayscale(#8c99a1);
-
-$color-text: #444;
-$color-text-light: white;
-$color-text-light-link: white;
-$color-text-dark: #1f1f1f;
-$color-text-dark-link: grayscale(#3EBAE0);
-
-$color-button-constructive: #77b53f;
-$color-button-destructive: #f00;
-
-$color-warning: #FF9300;
-$color-error: #FF9300;
-$color-notice: #FF9300;
-
-/** -----------------------------------------------
- * Typography
- * ------------------------------------------------ */
-$font-family: Arial, sans-serif;
-$font-base-size: 13px;
-$font-base-lineheight: 16px;
-
-/** -----------------------------------------------
- * Application Logo (CMS Logo)
- * ------------------------------------------------ */
-$application-logo-small: image-url("logo_small.png");
-$application-logo-small-ysize: 25px;
-$application-logo-small-xsize: 25px;