Under "Appearance," click Reset to default. You'll see the classic Google Chrome theme again.

At the top right of chrome, click and then Settings.

A theme is a special kind of extension that changes the way the google chrome browser looks. It is a zipped bundle of fles: one manifest.json file and several png images

Here is an example manifest.json file for a theme:

{ "version": "1.0", "name": "test theme", "description": "A test theme", "theme": { "images" : { "theme_frame" : "images/theme_frame_camo.png", "theme_toolbar" : "images/theme_toolbar_camo.png", "theme_ntp_background" : "images/theme_ntp_background_norepeat.png", "theme_ntp_attribution" : "images/attribution.png" }, "colors" : { "frame" : [71, 105, 91], "toolbar" : [207, 221, 192], "ntp_text" : [20, 40, 0], "ntp_link" : [36, 70, 0], "ntp_section" : [207, 221, 192], "button_background" : [255, 255, 255] }, "tints" : { "buttons" : [0.33, 0.5, 0.47] }, "properties" : { "ntp_background_alignment" : "bottom" } } }

version: One to four dot-separated integers identifying the version of this theme.

name: A short, plain text string (no more than 45 characters) that identifies the theme.

description: A description text for your theme.

images: Image resources for this theme. For example, "theme_ntp_background" uses to specify the background of the new tab pane.

colors: Colors are in RGB format, which is used to specify the color of the bookmark text, frame, etc.

tints: You can specify tints to be applied to parts of the UI such as buttons, the frame, and the background tab.

Tints are in Hue-Saturation-Lightness (HSL) format, using floating-point numbers in the range 0 - 1.0: - Hue is an absolute value, with 0 and 1 being red. - Saturation is relative to the currently provided image. 0.5 is no change, 0 is totally desaturated, and 1 is full saturation. - Lightness is also relative, with 0.5 being no change, 0 as all pixels black, and 1 as all pixels white. You can alternatively use -1.0 for any of the HSL values to specify no change.

properties: this field lets you specify properties such as background alignment, background repeat.