mw wp form でcssを分岐するとき

mwwpform.sass

.mw_wp_form{
	.stepimg{
		width: 100%;
		height: 80px;
		background-image: url(../images/step1.png);
		background-repeat: no-repeat;
		background-position: top center;
	}
	.mw-wp-form_image{
		img{
			max-width:100%;
			height: auto;
		}
	}
	&.mw_wp_form_confirm{
		.stepimg{
			background-image: url(../images/step2.png);
		}
		dl dd {
			color: #000;
			.label {
				color: #823F00;
			}
			.mail2nd{
				display: none;
			}
		}
		.agreement{
			display: none;
		}
	}
	&.mw_wp_form_complete{
		.stepimg{
			background-image: url(../images/step3.png);
		}
	}
}