Donwload background interface of the buttons in the form of a touch screen with icons. Blue Digital. Digital is available in 360x260, 768x768, 1080x1080, 4042x4042 pixels resolutions. Choose Blue-Digital.jpg's appropriate size/resolution from following which best fit on your device.
To download above image, click on the download button, the wallpaper will open in browser's new window, then right click on the Digital image and select 'save as' to save on your computer/laptop.