body {
  height: 100%;
  background:#79b8dc;
  font-family:
  'Source Sans Pro', sans-serif;
  font-size:15px; 
  color: #666;
  letter-spacing:0.5px;
  }
  
#header {
  position: absolute; 
  top: 0px; 
  left: 0px; 
  width: 100%; 
  background-color: #3d423d; 
  line-height: 80px;
  text-align: center;
  font-family: 'Comic Sans MS', sans;
  font-size: 40px; 
  color: #ffffff;
  letter-spacing: 3px;
  }
  

#box1 {
  margin: 0 auto;
  margin-top: 142px; 
  width: 800px;
  padding: 26px;
  background-color: #fff;
  font-size: 16px;
  line-height: 22px;
  height:100%;
  }
  
#box2 {
  position: relative;
  margin-bottom: 16px;
  width: 556px;
  }
  
#box3 {
  position: relative; 
  float: right; 
  width: 200px;
  }
  
#foot {
  clear: both;
  text-align: center;
  font-size: 11px;
  }
  
h1 {
  display: block;
  border-right: 10px solid #d45558;
  font-family: 'Source Sans Pro';
  font-size: 18px; 
  line-height: 22px;
  font-weight: normal; 
  background-color: #3d423d;
  letter-spacing: 1px;
  padding: 6px;
  color: #fff
  }
  
textarea {
  width: 100%
  }
  body {
	margin: 0;
	height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
	background: linear-gradient(to right bottom, gold, chocolate);
}

nav ul {
	list-style-type: none;
	padding: 0;
}

nav ul li {
	font-size: 40px;
	font-family: sans-serif;
	background-color: white;
	border: 2px solid black;
	letter-spacing: 0.1em;
	width: 5em;
	height: 1.5em;
	line-height: 1.5em;
	position: relative;
	overflow: hidden;
	margin: 0.5em;
	cursor: pointer;
}

nav ul li span {
	color: white;
	mix-blend-mode: difference;
}

nav ul li::before {
	content: '';
	position: absolute;
	width: 1.5em;
	height: inherit;
	background-color: black;
	border-radius: 50%;
	top: 0;
	left: -0.75em;
	transition: 0.5s ease-out;
}

nav ul li:hover::before {
	transform: scale(7);
}