MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */

//overwrite width of input field dropdown
#pfForm select {
  width:100% !important;
}

// set width of botton dropdown, e.g. on page "Resources"
div.pageheader-form-button.formbutton-add.formbutton-add--dropdown div.te-dropdown-menu {
  width:400px !important;
}