config file says invalid confugration

[luvrahul13]

Configuration invalid!
Error loading /config/configuration.yaml: mapping values are not allowed here
in "/config/themes/tablet/tablet.yaml", line 30, column 68

27 | ... ="all" rel="stylesheet" href="https://github.githubassets.com ...
28 | ...
29 | ...
30 | ... " content="{"groups": [], "environmentKey&quot ...
-----------------------------------------^
31 | ...
32 | ...