Check styles in previously existed ui elements

[lilliputten]

Eg, column alignments in events-list-table: they're mixed now in an unobvious way (left- or center-aligned):

Other places which require an attention to improve ux/design:

A comment after the buttons block:

A solid (and a bit boring) introduction text on the top of the membership form:

A boring and unstructured ('flat') greeting text on the main page: