Adding text-shadow to all Astrid Links

Hi there.
What would be the css code to add a slight drop shadow to all Astrid Links?
The yellow alone on white background is not readable in a very good sense.
Example here:

Hello,

First thanks for using our theme!

You can try with the given custom CSS code below at Appearance > Customize > Additional CSS:

a {
    text-shadow: 0px 1px 1px black;
}

But probably that’s not the best way to make the links more readable. Probably the best way is change the color of the links instead of add shadow.

We hope this helps!

Kind Regards,

Rodrigo.

aThemes Support