Help with CSS Customization for Backyard Theme

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Hi!

I am a somewhat computer savvy individual who hosts my own fashion blog using www.remarpro.com and recently installed a new theme that has required me to do some CSS customization. I am somewhat familiar with html so I have been able to piece together some of the changes I wanted to make like changing the color of links, hover, highlighting, and some text. But, there are a few things I haven’t been able to figure out how to change the color of. I don’t need to change font type, only color.

1. On each post there is a “read more” button that is currently yellow.
2. On each post the “Post Comment” button is the wrong color.
3. The date of each post is displayed in the wrong color.
4. The search bar and comment box both are outlined in yellow when you click to type.
5. While all the other links in my post changed colors, the links to my pages (e.g. About, Instagram) on my header did not change and must need a separate code.

Any help you can give me would be greatly appreciated, or even links to good resources to find these answers.

My theme is “Backyard”, and my website is linked below.
https://ivorytowerchic.com/

Thank you!

The blog I need help with is ivorytowerchic.com.