Removing bullets in Gravity form

Hi, I have just installed the Gravity form plugin and this works fine… only one thing needs to be adjusted. Mantra is displaying my form with bullets for every question and answer in my form. They have provided me with some code to adjust this:

body .gform_wrapper form .gform_body ul,
body .gform_wrapper form .gform_body ul li { 
	list-style-type: none !important; 
	list-style-image: none !important;
	list-style: none !important; 
	background-image: none !important;
	background: none !important;
	padding: 0 !important;
	margin: 0 !important;
	border: none !important
}
body .gform_wrapper form .gform_body ul > li:before {
	content: "";
}

I have tried inserting this code on several places… but every time my website goes bananas… Where do I need to insert this code? Which sheet and even more important where in the sheet?

Kind Regards,
Arjan