<script type="text/javascript">
            $(function(){
                if(!_spPageContextInfo.isSiteAdmin){ //if user is not side admin then hide the controls

// here you can hide these control using below code not directly using css in cewp

$("#globalNavBox").css({"display": "none"});
$("#welcomeMenuBox").css({"display": "none"});
$("#suiteBarLeft").css({"display": "none"});
$("#titleAreaBox").css({"display": "none"});
$("#ms-help").css({"display": "none"});
$("#RibbonContainer-TabRowRight").css({"display": "none"});
$(".ms-cui-tts").css({"display": "none"});
$(".ms-breadcrumb-top").css({"display": "none"});
$(".ms-dialogHidden").css({"display": "none"});
$(".ms-cui-topBar2").css({"display": "none"});
$(".ms-cui-tts").css({"display": "none"});

                }
            });
        </script>