Sales message, line by line styling

[line1]

I have changed a sales message text, and added breaks, so now there are 3 lines.
Something like:

The description of the gadget.
Address.
Phone.

I would like to make the first line larger font and bold, and the other 2 lines - smaller font and regular weight.
I probably should add some inline styling, like <strong></>.
Or may be to assign an ID to the first line and then to other 2 and add styling into the css?
If yes, where should it be done?
I used Developer's tool, but it gives out only one file, which is "header.php", and I don't think it is the file where those additions can be made. or is it the one?
Thank you.

[kobra]

Add inline styling to header.php for the define('HEADER_SALES_TEXT',

[gjh42]

In that define, you can just give each part of the message <span> tags with an id or class, and then do detailed styling of those ids/classes in your stylesheet.

[line1]

Thank you!
Works great.