!!!
%html
  %head
    %title Kuva
    = stylesheet_link_tag    "kuva/application", media: "all"
    = javascript_include_tag "kuva/application"
    = csrf_meta_tags

  %body(class: params[:controller].parameterize)
    = yield

!!!
%html
  %head
    %title Kuva
    = stylesheet_link_tag    "kuva/application", media: "all"
    = javascript_include_tag "kuva/application"
    = csrf_meta_tags

  %body
    = yield

Remove the controller specific class (styling).
Remove the controller specific class (styling).