html>div{
    display: none;
}

H1{display: inline-block;}

body{
	background-color:rgb(200,200,200);
	overflow: auto;
	margin-left: 5%;
	margin-right:5%
}

body.dark {
	background-color:RGB(170,170,170);
}

p{
	max-width:512px;
	margin:5 0 5 0;
	padding:0;
}

.page {
	display: flex;
	flex-flow: row wrap;
	max-width:900px;
	min-width: 500px;
	margin-left:auto;
	margin-right:auto;
	margin-top:0;
	margin-bottom:0;
	flex-basis: auto;
	flex-shrink: 0;
	flex-direction:column;
	padding:0;
	justify-content: space-between;
}

.column {
	width: 400px;
	flex-basis: auto;
	flex-shrink: 0;
	padding-right:20px;
	align-items: center;
	align-content:center;
	align-self: center;
}

.row{
	display: flex;
	flex-flow: row wrap;
	justify-content: space-between;
	align-items: center;
	align-content:center;
	align-self: center;
}

.review_row {
	display: flex;
	flex-direction:row;
	justify-content: space-between;
	align-items: center;
	align-content:center;
	align-self: center;
	max-width:800;
	min-width:425;
	flex-flow: row wrap;
	flex-basis:auto;
	margin-left:auto;
	margin-right:auto;
}

.math_row{
	display: flex;
	flex-flow: row wrap;
	justify-content: space-between;
	align-items: center;
	align-content:center;
	align-self: center;
}

.math_thumb{
	width:200;
	padding:20;
}

.middle {
	width:512px;
	margin-left:auto;
	margin-right:auto;
}

.header_table {
	width: 900;
	height:282;
}

.header_cell {
	width:225;
	height:141;
	margin-left:auto;
	margin-right:auto;
	padding:0;
	vertical-align:middle;

}

.finger {
	margin:auto;
	text-align:left;
	width:160;
	height:130;
}

.logo {
  width:auto;
  height:300;

}

.math_header {
	width:250;
	height:140;
}
	
.buy-button {
	width:120;
	height:100;
	padding:20;
}

.buy-button-big {
	width:150;
	height:123;
	padding:20;
}

.sample {
	text-align: center;
	font-size:small;
	width:400;
}
.excerpt {
	background-color:white;
	width:360px; 
	font-family: Georgia, serif; 
	font-size:14; 
	padding: 20px; 
	background-image:url('images/gray-frame.jpg'); 
	background-size:100% 100%;
	margin-left:auto;
	margin-right:auto;
	text-align:left;
}

.example{
	background-color:rgb(255,255,255);
	width:512px;
	font-family: Georgia, serif;
	font-size:14;
	padding-top: 10px;
}

.book_pic {
	width:150;
	height:109;
}

.downloadtable{
	width:900px;
}

.downloadcell{
	text-align:center;
	width:400;
	height:120;
	margin:40;
}

}
.cover_cell {
	width:300; 
}

.cover {
	width:300;

	padding-bottom:0;
	padding-top:0;
}

#navbar {
    list-style-type: none;
    overflow: hidden;
    background-color: #777;
    width: 860;
}

#navbar li {
    float: left;
}

#navbar li a {
    display: block;
    color: white;
    text-align: center;
    padding: 6px 16px;
    text-decoration: none;
	font-size: 14;
}

#navbar li a:hover:not(.active) {
    background-color: #020202;
}

#navbar .active {
    background-color: #4CAF50;
}

.buy_cell {
	width:200;
	text-align:center;
	padding-bottom:20px;
}

.thumb_cell {
	width:266;
	padding-bottom:20px;
}

.thumb {
	width:300;
}

.center {
	text-align:center;
	color:black;
	display:block;
	margin-left:auto;
	margin-right:auto;
}

.centered {
	text-align:center;
	color:black;
}

.right {
	float:right;
	padding-left: 10px;
} 

.left {
	float:left;
	padding-right: 10px;
} 
.buttonbox {
	padding:10px
}

.button {
    background-color: #4CAF50;
    border: none;
    color: black;
	background-color:46bd3d;
    padding: 10px;
    text-align: center;
    text-decoration: none;
	font-family: arial;
    display: inline-block;
    font-size: 14px;
    cursor: pointer;
	border-radius: 8px;
}
.button:hover {
    background-color: #5cc052; /* light green */
    color: white;
}
.caption {
	text-align: center;
	font-style: italic;
	font-size:small;
	}

a:link{
	color: white;
	text-decoration: none;
	text-align:center;
}

a:visited {
	color: white;
}

span.bigbold {
	font-size:200%;
	font-style:bold;
}

table, td {
	text-align:center;
	margin-left:auto;
	margin-right:auto;
} 

table.gallery {
    border-collapse: separate;
    border-spacing: 0 1em;
}

ul {
	text-align: left;
}

a {
	text-decoration:none;
}

img {
	border:none;
}


img.math_chapter {
	width:50%; 
	float:right;
	padding-left:10px;
}


p.disclosure {
	margin-left:auto;
	margin-right:auto;
	text-align: center;
	font-size: x-small;
	color:dark-gray;
}

</style>