Use case 1: load additional stylesheets to skin the Backend

Step 1: add following line into ext_tables.php to register the extension

$GLOBALS['TBE_STYLES']['skins'][$_EXTKEY]['name'] = $EXTKEY;

Step2: save CSS files with your extension.The name of the CSS files does not matter really. More importantly, CSS files need to be saved in a specific location to be automatically added onto the Backend:

- EXT:extension/stylesheets/structure/- EXT:extension/stylesheets/visual/

((generated))

Example of CSS

table.t3-page-columns {
    width:100%; // 800px
}

td.t3-page-column-2 {
    min-width:200px;
    Width:20%;
    background-color:red;
}

td.t3-page-column-0{
    width:78%;
    min-width:400px;
}

As an example, have a look at the extension pagemodulecss at Forge.