Changing Colour Scheme on Blog Page & Portfolio Question

Good Morning.

I’m just wondering, is it possible to change the colour of blog post ‘Read More’ boxes & hyperlinks (ie. ‘By Amy Tinson’) on the blog page ( from purple to the pink on my home page (

Also, when I hover over an image on my portfolio page (, it shows ‘Warning: implode(): Invalid arguments passed in /home/amytinso/public_html/wp-content/themes/shapely/archive-jetpack-portfolio.php on’. How do I stop this from happening?

Thanks in advance.