To change the color of the first two letters in a heading using Webflow, you can use the following steps:
1. Select the heading element that you want to modify by clicking on it in the Webflow Designer.
2. In the Style panel on the right side of the Designer interface, locate the Typography section.
3. Click on the "Custom" link next to the "Text Color" option to enter the custom code.
4. In the code editor that appears, you can write unique CSS code to target the first two letters of the heading. For example, you can use the `::first-letter` pseudo-element to select the first letter and `:nth-child(n)` selector to select the second letter.
Here's an example of how you can write the CSS code:
```css
.your-heading-class::first-letter,
.your-heading-class:nth-child(2) {
color: blue;
}
```
Note: Replace `.your-heading-class` with the class name of your heading element.
5. After adding the code, click outside of the code editor to save the changes.
Now, the first two letters of your heading should have the color you specified. You can adjust the color value to any valid CSS color value (e.g., HEX code, RGB, color name) according to your design requirements.
Remember to publish or update your site to see the changes reflected on the live site.