German election: What do the terms 'right' and 'left' mean, if both CDU and SPD are in the center?

In recent years Angela Merkel and the CDU have moved away from conservative positions and the SPD has disenchanted working class voters. In the German election the difference between right and left has become blurred.

source https://www.dw.com/en/german-election-what-do-the-terms-right-and-left-mean-if-both-cdu-and-spd-are-in-the-center/a-37601594?maca=en-rss-en-ger-1023-rdf