stylesheet.css

body {
    margin: 0;
    font-family: 'Lato', sans-serif;
    background-image: url("http://cdn.wonderfulengineering.com/wp-content/uploads/2014/07/background-wallpapers-7.jpg");
    background-size: cover;
}
table{
	table-layout:fixed;
}

.unsatisfiedCounter{
	color:#ff0000;
	font-weight:bold;
}

.satisfiedCounter{
	color:#33cc33;
}

.mainTimetable1{
	background-color:#FFF;
}

.mainTimetable2{
	background-color: #e6e6e6;
}

.selectCourse1{
	position: relative;
	font-size:30px;
	color: #818181;
	cursor:pointer;
    top: 10%;
    width: 100%;
    text-align: center;
    margin-top: 30px;
}

.modulesToClear{
	background-color: #333333;
	color:#FFF;
	cursor: pointer;
}

.modsTableHeader{
	background-color: #333333;
	color:#FFF;
	cursor: pointer;
}

.mods{
	display:none;
	text-align:center;
}

.current{
	background-color:#000000;
}

.dragObject{
	background-color: #33cc33;
	border-style: solid;
	text-align:center;
	float:left;
	width: 120px;
	margin:10px;
	color: #fff;
	border: solid 2px #cccccc;
	cursor:move;
	padding: 20px;
}

.noDragObject{
	background-color: #ff0000;
	border-style: solid;
	text-align:center;
	float:left;
	width: 120px;
	margin:10px;
	color: #fff;
	border: solid 2px #cccccc;
	cursor:move;
	padding: 20px;
}

.preclusionObject{
	background-color: #6600ff;
	border-style: solid;
	text-align:center;
	float:left;
	width: 120px;
	margin:10px;
	color: #fff;
	border: solid 2px #cccccc;
	cursor:move;
	padding: 20px;
}

nav {
  background-color: #333333;
  position:fixed;
  width:100%;
  z-index:1;
}

nav li {
  display: inline;
  color: #FFF;
  font-size: 20px;
  margin: 10px;
  padding: 20px;
  cursor: pointer;
}

footer{
	background-color: #333333;
	position: fixed;
    left: 0;
    bottom: 0;
    height: 20px;
    width: 100%;
    text-align:left;
	color:white
}

.overlay {
    height: 0%;
    width: 100%;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0, 0.9);
    overflow-y: hidden;
    transition: 0.5s;
}

.overlay-content {
    top: 10%;
    width: 100%;
    text-align: center;
    margin-top: 30px;
}

.overlay a {
    padding: 8px;
    text-decoration: none;
    font-size: 24px;
    color: #818181;
    display: block;
    transition: 0.3s;
}

.overlay a:hover, .overlay a:focus {
    color: #f1f1f1;
}

.closebtn {
    position: absolute;
    top: 20px;
    right: 45px;
    font-size: 60px !important;
}

@media screen and (max-height: 450px) {
    .overlay {overflow-y: auto;}
    .overlay a {font-size: 20px}
    .closebtn {
          font-size: 40px !important;
          top: 15px;
          right: 35px;
    }
}

[data-tooltip] {
    display: inline-block;
    position: relative;
    cursor: move;
    padding: 20px;
}

/* Tooltip styling */
[data-tooltip]:before {
    content: attr(data-tooltip);
    display: none;
    position: absolute;
    background: #000;
    color: #fff;
    padding: 4px 8px;
    font-size: 14px;
    line-height: 1.4;
    min-width: 200px;
    text-align: center;
    border-radius: 4px;
    white-space: pre-wrap;
}
/* Dynamic horizontal centering */
[data-tooltip-position="top"]:before,
[data-tooltip-position="bottom"]:before {
    left: 50%;
    -ms-transform: translateX(-50%);
    -moz-transform: translateX(-50%);
    -webkit-transform: translateX(-50%);
    transform: translateX(-50%);
}
/* Dynamic vertical centering */
[data-tooltip-position="right"]:before,
[data-tooltip-position="left"]:before {
    top: 50%;
    -ms-transform: translateY(-50%);
    -moz-transform: translateY(-50%);
    -webkit-transform: translateY(-50%);
    transform: translateY(-50%);
}
[data-tooltip-position="top"]:before {
    bottom: 100%;
    margin-bottom: 6px;
}
[data-tooltip-position="right"]:before {
    left: 100%;
    margin-left: 6px;
}
[data-tooltip-position="bottom"]:before {
    top: 100%;
    margin-top: 6px;
}
[data-tooltip-position="left"]:before {
    right: 100%;
    margin-right: 6px;
}

/* Tooltip arrow styling/placement */
[data-tooltip]:after {
    content: '';
    display: none;
    position: absolute;
    width: 0;
    height: 0;
    border-color: transparent;
    border-style: solid;
}
/* Dynamic horizontal centering for the tooltip */
[data-tooltip-position="top"]:after,
[data-tooltip-position="bottom"]:after {
    left: 50%;
    margin-left: -6px;
}
/* Dynamic vertical centering for the tooltip */
[data-tooltip-position="right"]:after,
[data-tooltip-position="left"]:after {
    top: 50%;
    margin-top: -6px;
}
[data-tooltip-position="top"]:after {
    bottom: 100%;
    border-width: 6px 6px 0;
    border-top-color: #000;
}
[data-tooltip-position="right"]:after {
    left: 100%;
    border-width: 6px 6px 6px 0;
    border-right-color: #000;
}
[data-tooltip-position="bottom"]:after {
    top: 100%;
    border-width: 0 6px 6px;
    border-bottom-color: #000;
}
[data-tooltip-position="left"]:after {
    right: 100%;
    border-width: 6px 0 6px 6px;
    border-left-color: #000;
}
/* Show the tooltip when hovering */
[data-tooltip]:hover:before,
[data-tooltip]:hover:after {
    display: block;
    z-index: 50;
}