Alright, let's add a very light blue for a section header that will complement your soft red theme. Here's a suggestion:

Section Header: #e0f2fe

Explanation:
#e0f2fe is an extremely light, almost white, blue. It's subtle enough to not clash with your red theme, and the slight blue tint will provide a gentle visual separation for section headers. It is also very close to the light color of the other table elements.

When you want a very light version of an RGB color, you essentially want to shift that color's values closer to the maximum RGB value, which is rgb(255, 255, 255) (white). Here's how we can approach that, and a suggestion for a very light version of rgb(77, 38, 18):

Understanding the Color:
rgb(77, 38, 18) is a dark, brownish-red color.

Creating a Lighter Version:
To make it very light, we need to increase the red, green, and blue values significantly, while maintaining their relative proportions to preserve the color's hue.

Suggested Color:
Hex: #fdece6
RGB: rgb(253, 236, 230)

Explanation:
This color is very close to white, but it retains a subtle warm, brownish-red tint. This will provide a very light version of the original color.

Below is your calendly booking. I am glad I could be of assistance.