body{
	background-color: 	#B22222;
	text-align: center;
  min-width: 630px;

}
header{
	text-align: center;
	color:white;
}

section{
	background-color: #F5DEB3;
	width:90%;
	display: inline-block;
	padding: 5px;
	margin: 5px;
	border-radius: 5px;
	text-align: center;
}
article{
	text-align: center;
	display:inline-block;
	padding:5px;
	border-radius: 5px;
	border-style: solid;
    border-color: #000000;
    border-width: 1px;
}

.index{
  text-align: justify;
    text-justify: inter-word;
}

.index h4{
  text-align: center;
}

.variable{
	display:inline-block;
	width:20%;
	height:20%;
	background-color: #B0C4DE;
	margin:5px;
}

@media(max-width: 1000px){

body{
  font-size:28px;
}


.variable {
  font-size:18px;
  display:inline-block;
  width:80%;
  height:30%;
  background-color: #B0C4DE;
  margin:5px;
}

}

.calculate{
  width: 75%
}

.container{
  padding: 5px;
  width: 100%;
  text-align: center;
  display:inline-block;
}

img{
  width: auto;
  max-width: 400px;
  max-height: 300px;
  display:inline-block;
}




/******************************************/
#nav {
    position:relative;
    width:90%;
    margin:0 auto;
    margin-top:5px;
    vertical-align: middle;
    /*padding:10px;*/
}
 
ul#navigation {
  width: 100%;
    margin:0px auto;
    position:relative;
    float:left;
    border-left:1px solid #c4dbe7;
    border-right:1px solid #c4dbe7;
       -webkit-padding-start: 0px;
}
 
ul#navigation li {
    display:inline-block;
    width: 25%;
    height: 50px;
    font-weight:bold;
    font-size:16px;
    margin:0;
    /*padding:0;*/
    float:left;
    position:relative;
    border-top:1px solid #c4dbe7;
    border-bottom:2px solid #c4dbe7;
    vertical-align: middle;
}
 
ul#navigation li a {
  width: 80%;
  height: 100%;
    /*padding:10px 25px;*/
    color:#616161;
    text-shadow:1px 1px 0px #fff;
    text-decoration:none;
    display:inline-block;
    border-right:1px solid #fff;
    border-left:1px solid #C2C2C2;
    border-top:1px solid #fff;
    background: #f5f5f5;
    vertical-align: middle;
 
    -webkit-transition:color 0.2s linear, background 0.2s linear;
    -moz-transition:color 0.2s linear, background 0.2s linear;
    -o-transition:color 0.2s linear, background 0.2s linear;
    transition:color 0.2s linear, background 0.2s linear;

}
 
ul#navigation li a:hover {
    background:#f8f8f8;
    color:#282828;
}
 
ul#navigation li a.first {
    border-left: 0 none;
}
 
ul#navigation li a.last {
    border-right: 0 none;
}
 
ul#navigation li:hover > a {
    background:#fff;
}

/* Drop-Down Navigation */
ul#navigation li:hover > ul
{
/*these 2 styles are very important,
being the ones which make the drop-down to appear on hover */
    visibility:visible;
    opacity:1;
}
 
ul#navigation ul, ul#navigation ul li ul {
    list-style: none;
    margin: 0;
    padding: 0;
/*the next 2 styles are very important,
being the ones which make the drop-down to stay hidden */
    visibility:hidden;
    opacity:0;
    position: absolute;
    z-index: 99999;
    width:100%;
    background:#f8f8f8;
    box-shadow:1px 1px 3px #ccc;
    text-align: center;
/* css3 transitions for smooth hover effect */
    -webkit-transition:opacity 0.2s linear, visibility 0.2s linear;
    -moz-transition:opacity 0.2s linear, visibility 0.2s linear;
    -o-transition:opacity 0.2s linear, visibility 0.2s linear;
    transition:opacity 0.2s linear, visibility 0.2s linear;
}
 
ul#navigation ul {
    top: 43px;
    left: 1px;
}
 
ul#navigation ul li ul {
    top: 0;
    left: 181px; /* strong related to width:180px; from above */
}
 
ul#navigation ul li {
    clear:both;
    width:100%;
    border:0 none;
    border-bottom:1px solid #c9c9c9;
    vertical-align: middle;
}
 
ul#navigation ul li a {
    background:none;
    /*padding:7px 15px;*/
    color:#616161;
    text-shadow:1px 1px 0px #fff;
    text-decoration:none;
    display:inline-block;
    border:0 none;
    /*float:left;*/
    clear:both;
    width:100%;
    vertical-align: middle;
}