Sample CSS for styling Gravity Forms in Genesis. http://sridharkatakam.com/sample-css-styling-gravity-forms-genesis/

style.css

.entry .gform_wrapper {
	max-width: 100%;
	margin-bottom: 28px;
}

.gform_wrapper ul li.gfield {
	margin-bottom: 20px;
}

.entry .gform_wrapper input[type=text],
.entry .gform_wrapper input[type=url],
.entry .gform_wrapper input[type=email],
.entry .gform_wrapper input[type=tel],
.entry .gform_wrapper input[type=number],
.entry .gform_wrapper input[type=password] {
	padding: 7px;
	font-size: 18px;
	border-radius: 5px;
}

.entry .gform_wrapper form {
	background: #f2f2f2;
}

.entry .gform_wrapper h2.gsection_title,
.entry .gform_wrapper .gsection_description,
.entry .gform_wrapper h3.gform_title {
	width: 100%;
}

.entry .gform_wrapper .gform_heading {
	width: 100%;
	margin-bottom: 0;
}

.entry .gform_wrapper h3.gform_title {
	margin-top: 0;
	margin-bottom: 0;
	background: #6d6e70;
	color: #fff;
	padding: 20px;
	border-top-left-radius: 5px;
	border-top-right-radius: 5px;
	-webkit-box-sizing: border-box;
	-moz-box-sizing:    border-box;
	box-sizing:         border-box;
}

.entry .gform_wrapper span.gform_description {
	padding: 20px;
	display: block;
}

.gform_wrapper span.gform_description p:last-child {
	margin-bottom: 0;
}

.entry .gform_wrapper .gform_body {
	padding: 0 20px 0 20px;
}

.entry .gform_wrapper .top_label .gfield_label {
	color: #6d6e70;
}

.entry .gform_wrapper .gform_footer {
	padding: 0 20px 20px 20px;
}

.entry .gform_wrapper .gform_footer input.button,
.entry .gform_wrapper .gform_footer input[type="submit"] {
	background: #d8452e;
	border-radius: 5px;
	padding: 9px 18px;
	text-transform: none;
	font-weight: bold;
	letter-spacing: 1px;
}

.entry .gform_wrapper .gform_footer input.button:hover,
.entry .gform_wrapper .gform_footer input[type="submit"]:hover {
	background: #333;
}