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

body {
	font-family: Arial, sans-serif;
	font-size: 16px;
	line-height: 1.5;
}

header {
	background-color: #333;
	color: #fff;
	padding: 20px;
}

nav ul {
	list-style: none;
	display: flex;
}

nav li {
	margin-right: 20px;
}

nav a {
	color: #fff;
	text-decoration: none;
}

main {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	padding: 20px;
}

section {
	flex-basis: calc(33.33% - 20px);
	margin-bottom: 40px;
}

section h2 {
	margin-bottom: 10px;
}

section img {
	max-width: 100%;
	height: auto;
	margin-bottom: 10px;
}

footer {
	background-color: #333;
	color: #fff;
	padding: 20px;
	text-align: center;
}