app.css

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

body {
	background-color: pink;
}

h1 {
	color: black;
	background-color: green;
}

.snowey {
	background-color: lightblue;
	color: white;
	margin: 50px 10px 50px 10px;
}

.page {
	display: flex;
	flex-wrap: wrap;

	</-- default behavior of the page -->
}

.menu {
	</-- margin and padding same as * -->
	list-style-type: none;
	height: 100px;
}

.menu-item {
	float: left;
	list-style-type: none;
}

.block-menu-design {
	display: block;
	padding: 8px;
	background-color: lightseagreen;
}

.section {
	width: 100%;
	height: 250px;
	display: flex;
	justify-content: center;
	align-items: center;
}

.header {
	background-color: ghostwhite;
}

.content {
	background-color: lightgreen;
	height: 200px;
}

.feature-1 {
	background-color: palevioletred;
}

.feature-2 {
	background-color: blue;
}

.feature-3 {
	background-color: blueviolet;
}

.feature-4 {
	background-color: purple;
}

.contacts {
	background-color: turquoise;
}

@media only screen and (min-width: 401px) and (max-width: 960px) {
	.feature-1,
	.feature-2,
	.feature-3,
	.feature-4 {
		width: 50%;
	}
}

@media only screen and (min-width: 961px) {
	.page {
		width: 960px;
		margin: 0 auto; </-- centers it -->
	}
	.feature-1,
	.feature-2,
	.feature-3,
	.feature-4 {
		width: 25%;
	}
}