body {
	background-image: url('images/hell.jpg');
	background-repeat: no-repeat;
	background-size: cover;
	font-family: Helvectica, Arial, Sans-Serif;
}


a {
	text-decoration: none;
	color:red
}

h1, h2, h3 {
	margin: 0;
}

#container {
	background-color: #66FF00;
	width: 800px;
	margin-left: auto;
	margin-right: auto;
}
#header {
	background-color: #FF13F0;
	color: #ff000d;
	text-align: center;
	padding: 10px;
}
#content {
	padding: 10px;
}
#nav {
	width:180px;
	float: left;
}

#nav.selected {
    font-weight: bold;
}

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

#main {
	width:600px;
	float: right
}
#footer {
	clear: both;
	padding: 10px;
	background-color: #FF13F0;
	color: #ff000d;
	text-align: center;
}

body .content .sidebar {
	color: blue;
}
.grid-cointainer {
	display: grid;
	grid-template-columns: repeat(3,1fr);
	grid-gap: 10px;
}

.grid-item {
	background-color: lightblue;
	padding: 51px;
	border: 1px solid blue;
	text-align: center;
}