Need basic help with Styles and coloring text

Here is the existing code:

<td class='text-right' style='$style_color'>".$symbol.$amount."</td>

Code (markup):

$style_color is a dynamic variable that sets the colour to red or green. It is set above this code like this:
$style_color = 'color: #FF0000';
in an if statement.
$amount just holds a 2 decimal amount.

$symbol is ' + '
or
$symbol is ' - '

I basically want just the symbol to be red or green but the value to always remain black. How do I update the code to get...

Need basic help with Styles and coloring text

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