html {
	height: 100%;
	width: 100%;
}
body {
	margin: 0;
    background-color: white;
    font-family: Georgia Helvetica serif;
    font-size: 1.1em;
	width: 100%;
	height: 100%;
}

article {
	margin:0;
	min-height: 100%;
	display: flex;
	flex-direction: column;
	align-items: stretch;
}

main {
	margin-left:1rem;
	flex-grow: 1;
	flex-shrink: 0;
}

nav {
	padding: 0;
    background-color: rgb(31 30 30);
    text-align: center;
	flex-shrink: 0;
}

footer {
	padding: .25rem;
    background-color: dimgray;
    text-align: center;
    color: white;
	flex-shrink: 0;
}

hr {
	margin-right:1rem;
}

.nav-ul {
    list-style-type: none;
    margin: 0px;
    padding: 0;
    overflow: hidden;
    background-color: rgb(31 30 30);
}

.nav-li {
    float: left;
	padding: 0;
}

.nav-li-a {
    display: block;
    color: white;
    text-align: center;
    padding: 1rem 1rem;
    text-decoration: none;
	font-size: 1.5rem;
}

.nav-li-a:hover {
    background-color: rgb(17 17 17);
}
	
.h1_title {
    text-align: center;
}

.center_image {
	display: block;
	margin-left: auto;
	margin-right: auto;
	width: 50%;
}

.box {
	padding: 10px;
	border: 2px solid black;
}

/* tab the first line of the paragraph */
.p_tab { text-indent: 5%; }

/* tab the whole section */
.tab { margin-left: 5%;}

.light_green { color: limegreen; }

.red { color: red;}