Use Google Sign-In with the basic profile or email scopes and incorporate the following standard buttons in your mobile or web app:
| Style | Buttons | Image Files |
|---|---|---|
| Light |  | Download files Includes sign-In buttons in PNG, SVG, EPS, and Sketch formats, in many resolutions. Includes base, hover and press states. |
| Dark |  |
Sketch, SVG, and EPS files are included in the download so you can translate the "Sign in with" or "Sign in" text. These files require the Roboto font.
If you request additional scopes, do so with incremental authorization (Android, iOS, web), only prompting the user for authorization as they begin to interact with a feature that requires API access.
If you request YouTube scopes, use a YouTube button.
If you use Google Play games services, also see the Google Play games services branding guidelines.
Equal prominence
The Google Sign-In button must be displayed at least as prominently as other third party sign-in options. For example, buttons should be approximately the same size and have similar visual weight.
Matching your own app's style
Using the standard Google Sign-In button is strongly recommended as it enables Google users to more quickly identify the Google option. If you need to to adapt the button to match your app design or translate the text "Sign in with" or "Sign in", follow these guidelines.
Size
You can scale the button as needed for different devices and screen sizes, but you must preserve the aspect ratio so that the Google logo is not stretched.
Text
To encourage users to click the button, we recommend the call-to-action text "Sign in with Google" or "Sign up with Google". It should be clear to the user that they are signing in to your app or signing up for your app with their Google credentials, not signing up or registering for a Google account on your app.
"Google" Text
You can use the word "Google" by itself in the button if it is accompanied by adjacent text that makes it clear what the action is. For example:
Sign in with: 
Color
The color for an unpressed light button is #FFFFFF (white). The color for an unpressed dark (blue) button is #4285F4. The button background can be either blue or white, but the button must always include the standard color Google "G" on a white tile.
Font
The button font is Roboto Medium, a TrueType font. To install, first download the Roboto font and unzip the download bundle. On Mac, just double-click Roboto-Medium.ttf, then click "Install Font". On Windows, drag the file to "My Computer" > "Windows" > "Fonts" folder. Do not use other fonts on the button, except as noted for situations with Matching your own app's style.
For websites that use a custom sign-in button, you can load the Roboto font from Google Fonts.
Padding
The padding to the left (and right) of the text should be 8dp. The logo should be 18dp, and there should be 24dp between the logo and the button text.
Google logo in the "Sign in with Google" button
Regardless of the text, you can't change the size or color of the Google "G" logo. It must be the standard color version and appear on a white background. If you need to create your own custom size Google logo, start with any of the logo sizes included in the download bundle.
Incorrect button design
  | Do not use the Google icon or logo by itself without the button boundary and without text to indicate the user action. |
  | Do not use a Google icon by itself to represent Google Sign-In. |
  | Do not use dark or light versions of the Google "G". |
 | Do not put the standard color Google "G" icon on a colored background. |
 | Do not create your own icon for the button. |
  | Do not use the term "Google" by itself in the button without an accompanying Google icon. |
Use of Google brands in ways not expressly covered by this document is not allowed without prior written consent from Google (see the Guidelines for Third Party Use of Google Brand Features for more information).
Source: https://developers.google.com/identity/branding-guidelines
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