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The Opacity Modifier

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You can add an opacity modifier to ANY of the available color properties by adding an opacity value between 0 and 100 to the end of the color name separated with a slash ( / ).

In your XML files​

<Label class="w-11/12 h-8 text-center bg-sky-500/50 text-purple-900/75">My Button</Label>
// Main styles
'Window': { backgroundColor: '#ffffff' }
'.h-8': { height: 32 }
'.text-center': { textAlign: Ti.UI.TEXT_ALIGNMENT_CENTER }
'.w-11/12': { width: '91.666667%' }

// Styles with color opacity modifiers
'.bg-sky-500/50': { backgroundColor: '#800ea5e9' }
'.text-purple-900/75': { color: '#bf581c87' }

In the 'apply' Directive​

You can also use color opacity modifiers in the apply directive in the config.js file.

./purgetss/config.js
module.exports = {
  theme: {
    extend: {
      colors: {
        primary: '#ce10cc'
      }
    },
    '.main-banner': {
      apply: [
        'bg-primary/35',
        'border-primary/75'
      ]
    }
  }
}
Generated classes
// Custom Styles and Resets
'.main-banner': { backgroundColor: '#59ce10cc', borderColor: '#bfce10cc' }

// backgroundColor Property
'.bg-primary': { backgroundColor: '#ce10cc' }
...
// And the rest of color properties!
Semantic Colors

Semantic colors can't be modified with the opacity modifier, because they are defined as an object with light and dark values.