Using a Google Spreadsheet to feed input to a web application

I am building a mathematical web application, that gets as input a large matrix of numbers, and does some mathematical calculations on it. The common ways to feed input into such an application are:
An HTML table widget, where the user ca…
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Custom Google and Apple Signup/in buttons

I want to modify the default sign up and sign in buttons of Google and Apple for an iOS project keeping the changes as per their guidelines.
By default, these are like this:
And I want to use it like this(G’s border-radius updated to 6px,…