diff --git a/assets/scss/main.scss b/assets/scss/main.scss
new file mode 100644
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--- /dev/null
+++ b/assets/scss/main.scss
@@ -0,0 +1,207 @@
+/* base styles */
+* {margin: 0; padding: 0; box-sizing: border-box;}
+html {
+	font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
+	scroll-behavior: smooth;
+}
+body {
+	width: 100vw;
+	position: relative;
+}
+/* layout */
+.section {
+	padding: 1em 0;
+}
+@media (min-width: 480px) {
+	.section {padding: 2em 0;}
+}
+@media (min-width: 900px) {
+	.section {padding: 4em 0;}
+}
+.container {
+	width: 100%;
+	max-width: 960px;
+	margin: 0 auto;
+	padding: 0 1em;
+}
+.section-heading {
+	font-size: 1.2em;
+	font-weight: 400;
+	line-height: 1.2;
+	text-align: center;
+	max-width: 18ch;
+	margin: 0 auto;
+	margin-bottom: 4em;
+	padding-bottom: 1em;
+	border-bottom: 2px solid rgba(0,0,0,0.25)
+}
+/* site header */
+.site-header {
+	padding: 0.5em 0;
+}
+.site-header .container {
+	display: grid;
+	grid-template-columns: auto 1fr;
+	gap: 1em;
+}
+.site-title {
+	font-size: 1em;
+	align-self: center;
+	font-weight: 400;
+	line-height: 1;
+}
+.site-nav {
+	position: fixed;
+	bottom: 0;
+	left: 0;
+	z-index: 2;
+	width: 100vw;
+	height: 4em;
+	background: #212121;
+	color: white;
+	display: grid;
+	grid-template-columns: repeat(3, 1fr);
+}
+.site-nav__item {
+	display: flex;
+	flex-flow: column;
+	align-items: center;
+	justify-content: center;
+	text-decoration: none;
+		color: inherit;
+		border-top: 4px solid rgba(255,255,255,0.5);
+}
+.site-nav__item.active {
+		border-top: 4px solid #0060ff;
+}
+body {margin-bottom: 4em;}
+@media (min-width: 480px) {
+	.site-header .container {
+		grid-template-columns: auto 1fr auto;
+	}
+	.site-nav {
+		position: unset;
+		background: unset;
+		color: unset;
+		width: unset;
+		height: unset;
+	}
+	.site-nav__item.active {
+		background: unset;
+		color: #0060ff;
+	}
+	body {margin-bottom: 0}
+}
+/* hero section */
+.hero .container {
+	display: grid;
+	grid-template-columns: 1fr 1fr;
+	grid-template-rows: auto auto;
+	gap: 1em;
+}
+.hero img {
+	width: 100%;
+	grid-row: 1/3;
+}
+.headline {
+	font-size: clamp(1.4em, 7vw, 3em);
+	max-width: 11ch;
+	line-height: 1.2;
+	align-self: end;
+}
+.button {
+	background: #0060ff;
+	color: white;
+	width: max-content;
+	font-size: clamp(0.75em,2vw,1em);
+	padding: 0.75em;
+	display: flex;
+	justify-content: center;
+	text-decoration: none;
+	border-radius: 100em;
+	font-weight: 700;
+}
+.cta {grid-column: 1; grid-row: 2; align-self: start;}
+
+/* praise and testimonials */
+.testimonials {
+	display: flex;
+	flex-flow: row wrap;
+	gap: 1em;
+	justify-content: center;
+}
+.testimonial {
+	display: grid;
+	grid-template-columns: auto 1fr;
+	grid-template-rows: auto auto;
+	grid-gap: 1em;
+	margin-bottom: 1em;
+	flex-basis: 18em;
+}
+.avatar {
+	margin-left: 1em;
+	width: 2em;
+	height: 2em;
+	border-radius: 1em;
+	background: #212121;
+}
+.name {
+	align-self: center;
+}
+.bubble {
+	background-color: #212121;
+	color: white;
+	padding: 0.5em;
+	border-radius: 0.5em;
+	position: relative;
+	grid-column: span 2;
+	height: 80px;
+	display: flex;
+	justify-content: center;
+	align-items: center;
+	text-align: center;
+}
+.bubble:after {
+	content: '';
+	position: absolute;
+	top: 0;
+	left: 2em;
+	width: 0;
+	height: 0;
+	border: 0.5em solid transparent;
+	border-bottom-color: #212121;
+	border-top: 0;
+	margin-left: -0.5em;
+	margin-top: -0.5em;
+}
+/* skills */
+.skills {
+	list-style: none;
+	max-width: 18em;
+}
+.skill:before {
+	content: "+";
+	margin-right: 0.5em;
+}
+/* process */
+.cards {
+	display: grid;
+	grid-template-columns: repeat(auto-fit, minmax(15em,1fr));
+	gap: 1em;
+}
+.card {
+	background: white;
+}
+.card img {
+	width: 100%;
+	height: auto;
+}
+#process .card img {
+	height: 200px;
+}
+.card h3 {
+	margin: 1em 0;
+}
+.card p {
+	margin-bottom: 1em;
+}
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