html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background: #feffff;
}

header {
  background:linear-gradient(to right,#12e446,#00d4ff);
  height: 50px;
}


hr {
  border-bottom: 1px solid #07bfb6;
}

header h1 {
  color: white;
}


article {
  background: white;
  padding: 10px;
  width: 250px;
  margin: 20px;
  border-radius: 5px;
  border: 1px solid #52beb7;
  box-sizing: border-box;
}
h1 {
	margin: 0px;
	padding: 10px;
	text-align: center;
	font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
}

section {
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  justify-content: center;
  -webkit-flex-wrap: wrap; /* Safari 6.1+  */
  flex-wrap: wrap;
}

main {
  width: 100%;
  min-height: calc(100% - 85px);
  padding: 5px;
  box-sizing: border-box;
}

.banner {
  margin: 20px;
}

.banner img {
  width: 100%;
  display: block;
  max-width: 800px;
  margin: 0 auto;
}

footer {
	box-sizing: border-box;
	border-top: 1px solid white;
	width: 100%;
	background-color: #FFFFFF;
}

footer p {
  text-align: center;
  color: white;
}