Adding a background to subtitle text

Site URL: http://www.erindayhaw.squarespace.com

I want to preface this question with I am not very knowledgeable with design vocabulary within squarespace. 

I am using Image blocks with different designs (overlap, collage, etc) and I am including "subtitle" text on each one. 

However, I want to be able to add a background on the text. I am able to do it on the title of the image blocks, but not the "subtitle". 

Is there a CSS code I could insert to add a background to this text? Also, is there a way to add different colors of background text to different image blocks instead of the background being the same color for the entire website?

website is: http://www.erindayhaw.squarespace.com 

3 hours ago, ErinDayhaw said:

Site URL: http://www.erindayhaw.squarespace.com

I want to preface this question with I am not very knowledgeable with design vocabulary within squarespace. 

I am using Image blocks with different designs (overlap, collage, etc) and I am including "subtitle" text on each one. 

However, I want to be able to add a background on the text. I am able to do it on the title of the image blocks, but not the "subtitle". 

Is there a CSS code I could insert to add a background to this text? Also, is there a way to add different colors of background text to different image blocks instead of the background being the same color for the entire website?

website is: http://www.erindayhaw.squarespace.com 

Pls provide some screenshots of your issues that can help us a lot to find the solution

here is a screen shot. thanks!

On 11/6/2021 at 8:08 AM, ErinDayhaw said:

here is a screen shot. thanks!

Try adding to Design > Custom CSS

div#block-b41e08e1d2e3978ce02d .image-subtitle-wrapper {
    background-image: url(https://cdn.pixabay.com/photo/2021/11/02/15/30/tealights-6763542__340.jpg);
}