View source for Cascading Style Sheets

https://en.wikipedia.org/wiki/Cascading_Style_Sheets

===Primary CSS unit===
  1. Font sizing with rem (root em) http://snook.ca/archives/html_and_css/font-size-with-rem
  2. https://mindtheshift.wordpress.com/2015/04/02/r-i-p-rem-viva-css-reference-pixel/

===Colors===
  1. https://developer.mozilla.org/de/docs/Web/CSS/Farben

===Use of pseudo classes===
Examples
%%.article aside li:first-child {
    border-top: 0 none;
    margin-top: 0;
    padding-top: 0;
}
.article aside li {
    border-top: 1px solid #eee;
    line-height: 16px;
    margin-top: 0;
    padding: 6px 0 6px 80px;
    position: relative;
}%%

===force line break===
%%overflow-wrap: break-word;%% 
%% table {
    table-layout: fixed;
    width: 100%;
}

table td {
    overflow-wrap: break-word;
} %%