body, div, header, footer, section, article, nav {
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}

html {
	font-size: 100%;
}

body {
	margin: 0;
	padding: 0;
	font-size: 1em;
}

header, section, footer {
    margin-left: auto;
    margin-right: auto;
}

ul {
	margin: 0;
	padding: 0;
}