Creating Rounded Corners on a Markdown Box

Hello!!

I'm looking to create rounded corners on a number of markdown boxes. I've given them background colour and some text.  The site isn't public which is why I haven't shared the link. 

The current code i'm using is: 

#block-yui_3_17_2_1_1607630508175_18473
.sqs-block-content {
  border-radius: 25px;
}

I don't seem to be targeting the block correctly but i'm at a loss to see what else I can do. Any help on this would be so appreciated!!!!

Thanks

Helen

Hi

Please make your website password protected to check and help you!

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Best,
Leopold