img {width:100%;}
.img2 {background-image:url('img_2.jpg'); 
min-height: 250px; background-attachment: fixed; 
background-position: center; background-repeat: no-repeat; background-size: cover; opacity:0.4;
}
#container
{
	border: thin solid #B56A2A;
	background-color: #FFCC99;
	width: 80%;
	margin: 10px auto 10px auto;
	background-image: url('big-data.png');
}
#header {
	padding: 10px;
	background: no-repeat fixed center;
	text-align: center;
	margin: 10px 0px 10px 0px;
	color: #B56A2A;
	font-size: 34px;
	font-weight: bold;
	text-transform: uppercase;
}
#topnav 
{text-align:center; 
padding :10px 0px 10px 0px;
font-size:14px;
font-weight:bold;
text-transform:uppercase;
margin: 0px 10px 0px 10px;
}

#topnav ul 
{list-style-type:none;
text-align:center;
margin: 0px;}

#topnav ul li
{ display:inline;
	
}

#topnav ul li a 
{
	border: thin solid #B56A2A;
	padding: 5px;
	display: inline-block;
	text-decoration: none;
	width: 200px;
	color: white;
	background-color: #B56A2A;
}

#topnav ul li a:hover
{background-color: white; border:2px solid darkgreen; color:darkgreen;}

#content 
{
	width: 90%;
	margin: 0px auto 0px auto;
	padding: 10px 20px 10px 10px;
	border: 2px none darkgreen;
	text-align: justify;
	background-color: white;
	color: #31446A;
}
 
 #footer
 {width:80%;margin:10px;}
 
 #copyright {
	clear: both;
	text-align: center;
	background-color: #B56A2A;
	color: white;
	height: auto;
	width: 100%;
	text-transform: none;
	font-size: 18px;
	margin-top: 20px;
}
 
 #logoUni {height:30px; background-image:url('logo.png'); 
background-repeat:repeat; opacity: 0.4;
}
body {font-family: Arial;}

/* Style the tab */
.tab {
	border-top-left-radius: 50px;
	border-top-right-radius: 50px;
	border-bottom-right-radius: 50px;
	border-bottom-left-radius: 50px;
	overflow: hidden;
	border: 1px solid #CCEAF4;
	background-color: #EAF3D2;
	font-size: medium;
	font-weight: bold;
}

/* Style the buttons inside the tab */
.tab button {
  background-color: inherit;
  float: left;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 14px 16px;
  transition: 0.3s;
  font-size: 14px;
}

/* Change background color of buttons on hover */
.tab button:hover {
  background-color: #ddd;
}

/* Create an active/current tablink class */
.tab button.active {
  background-color: #ccc;
}

/* Style the tab content */
.tabcontent {
  display: none;
  padding: 6px 12px;
  border: 1px solid #ccc;
  border-top: none;
}
/* Style the buttons that are used to open and close the accordion panel */
.accordion {
	border-radius: 50px;
	background-color: #CCEAF4;
	border: thin white solid;
	color: #444;
	cursor: pointer;
	padding: 18px;
	width: 100%;
	text-align: left;
	border: thin solid #FFFFFF;
	outline: none;
	transition: 0.4s;
}

/* Add a background color to the button if it is clicked on (add the .active class with JS), and when you move the mouse over it (hover) */
.active, .accordion:hover {
  background-color: #ccc;
}

/* Style the accordion panel. Note: hidden by default */
.panel {
  padding: 0 18px;
  background-color: white;
  display: none;
  overflow: hidden;
}


{
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial;
}

/* The grid: Four equal columns that floats next to each other */
.column {
	margin: 0px auto 0px auto;
	float: left;
	width: 25%;
	padding: 10px;
}

/* Style the images inside the grid */
.column img {
  opacity: 0.8; 
  cursor: pointer; 
}

.column img:hover {
  opacity: 1;
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}

/* The expanding image container */
.container {
  position: relative;
  display: none;
}

/* Expanding image text */
#imgtext {
  position: absolute;
  bottom: 15px;
  left: 15px;
  color: white;
  font-size: 20px;
}

/* Closable button inside the expanded image */
.closebtn {
  position: absolute;
  top: 10px;
  right: 15px;
  color: white;
  font-size: 35px;
  cursor: pointer;
}
* {
  box-sizing: border-box;
}
/* Center website */
.main {
  max-width: 1000px;
  margin: auto;
}
.row {
  margin: 8px -16px;
}

/* Add padding BETWEEN each column */
.row,
.row > .column {
  padding: 8px;
}

/* Create four equal columns that floats next to each other */
.column {
  float: left;
  width: 25%;
}

/* Clear floats after rows */ 
.row:after {
  content: "";
  display: table;
  clear: both;
}

/* Content */
.content {
  background-color: white;
  padding: 10px;
}

/* Responsive layout - makes a two column-layout instead of four columns */
@media screen and (max-width: 900px) {
  .column {
    width: 50%;  }
}

/* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 600px) {
  .column {
    width: 100%;
  }
}