7.0 Cover Page: Add background color to text block

Site URL: https://www.decarbonista.world/challenge

Hi all,

I'm looking to add a semi-transparent background color to the content blocks (or at least the text blocks) in a Cover Page layout for a client. 

Website is: https://www.decarbonista.world/challenge

I've pasted in the code in the header of the Cover Page, but it doesn't seem to be working.  Code below.  Not sure what I'm doing wrong?  

<style>
#yui_3_17_2_1_1593622491163_415 {
background-color: rgba(0, 0, 0, 0.5);
 padding: 30px;
}
</style>

Thanks!

-Scott

Thank you, tuanphan!  That worked perfectly.  Appreciate it!!