Makes an on-premise SharePoint 2016 ribbon look/work like the 2013 Ribbon.

SharePoint 2016 - Make Ribbon look like 2013

<style>
/* SP2016 Ribbon adjustments */

    /* Puts babysuiteBar in the corner */
    #suiteBarDelta {position: absolute;top:0;right:0;max-width:300px;}

    /* Hides Waffle button */
    #suiteBarDelta .o365cs-nav-leftAlign    {display:none;}

    /* Hides About Me in dropdown */
    #suiteBarDelta #O365_SubLink_ShellAboutMe   {display:none;}

    /* Hide help button */
    #suiteBarDelta #O365_MainLink_Help {display: none;}

    /* Hide personalize button */
    #suiteBarDelta #O365_SubLink_SuiteMenu_zz4_ID_PersonalizePage {display:none;}

    /* Gear button height fix */
    #suiteBarDelta .o365cs-me-tile-nophoto-username-container,
    #suiteBarDelta .o365cs-me-tile-nophoto-username,
    #suiteBarDelta .o365cs-nav-button {height:35px;}

    /* Text color change for name/gear icon */
    #suiteBarDelta .o365cs-topnavText, 
    #suiteBarDelta .o365cs-base, 
    #suiteBarDelta .o365cs-base .ms-fcl-w {color:#666}
   
    /* Dropdown menu - match height to ribbon bar */
    #suiteBarDelta .o365cs-nav-contextMenu{top:35px !important}

    /* Background color eliminiate! */
    #suiteBarDelta #O365_NavHeader {background: none}
    #suiteBarDelta #O365_TopMenu {background-color:transparent}

    /* Swap gear and people picker */
    #suiteBarDelta .o365cs-nav-header16 .o365cs-nav-topItem {float:right;}
    #suiteBarDelta .o365cs-nav-rightMenus div:last-child {float:none;right:50px;}
</style>