* {
   box-sizing: border-box;
}

img {
   max-width: 100%;
   height: auto;
   border: 5px solid gold
}
body {
  margin: 0;
  font-family: Biome, Calibri, Arial, sans-serif;
  line-height: 2.0;
  font-size: 20px;
}

.banner {
	overflow: hidden;
	background-color: gold;
	border-bottom: 1px dashed yellow;
	padding: 1em;
	position: fixed;
	top: 0;
	z-index: 1000;
	width: 100%;
}

.banner h1 {
	margin: 0;
	text-align: center;
}


@media (min-width: 768px) {
	body {
		background-color: #ec6f1b;
		font-size: 100%;
	}
	.content-wrapper {
		overflow: hidden;
	    max-width: 1400px;
	    margin: 80px auto 0;
	}
	main {
		float: left;
		width: 70%;
		padding: 20px;
		margin-top: 20px;
		border-right: 2px solid #ECAA1B;
	}

	.sidebar {
		float: left;
		width: 30%;
		padding: 30px;
	}

	.clear {
	   clear: both;
	}
}

.site-footer {
	float: left;
	min-height: 1em;
	background-color: yellow;
	border-top: 1px solid blue;
	width: 100%;
	padding: 10px;
	border-right: 1px solid #EC901B;
}