* {
  box-sizing: border-box;
}

body {
    background-color: LightGrey;
	font-family: Segoe UI;
}

#nav_list {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: Grey;
    position: fixed;
    top: 0;
    width: 100%;
}

li {
    float: left;
}

#top_bar_name{
	display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
	font-weight: lighter;	
}

li a, .dropbtn {
    display: inline-block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

li a:hover, .dropdown:hover .dropbtn{
    background-color: white;
	color: black;
}

.active {
    background-color: MediumSeaGreen;
    color: white;
}

li.dropdown {
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: rgb(80, 80, 80);
	color: Grey;
    /*min-width: 160px;*/
    /*box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;*/
}

.dropdown-content a {
    color: white;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropdown-content a:hover {background-color: #f1f1f1}

.dropdown:hover .dropdown-content {
    display: block;
	position: fixed;
}


#heading {
	background-image: url("images/banner3.png");
	background-repeat: no-repeat;
	color: white;
	display: block;
	margin-top: 49px;
	padding: 40px 30px 10px 30px;
	height: 230px;
	margin-left: auto;
	margin-right: auto;
	max-width: 1600px;
}

#section_heading {
	/*background-image: url("images/banner3.png");*/
	background-repeat: no-repeat;
	color: white;
	display: block;
	margin-top: 49px;
	padding: 40px 30px 10px 30px;
	height: 230px;
	margin-left: auto;
	margin-right: auto;
	max-width: 1600px;
}

#title_name{
	font-size: 50px; 
	font-family: Georgia;
}

#title_tag_line{
	font-size: 30px; 
	font-style: italic;
	font-weight: bold;
}

#main_section{
	background-color: white;
	max-width: 1600px;
	margin: auto;
	padding: 40px 60px 40px 60px;
}

a.main_link:link{
	color: black;
	/*text-decoration: none;*/
}

a.main_link:visited {
    color: black;
	text-decoration: none;
}

a.main_link:hover {
	color: MediumSeaGreen;
	text-decoration: none;
}

/* Create three equal columns that floats next to each other */
.column {
  float: left;
  width: 50%;
  /*padding: 15px;*/
}
.column_image {
  float: left;
  width: 50%;
  padding: 15px;
}

.column_image {
  margin: auto;
}

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

/*publication link*/
a.publication_link:link{
	color: rgb(0, 0, 0);
	text-decoration: none;
	font-weight: bold;
	font-style: italic;
}

a.publication_link:visited {
    color: rgb(0, 0, 0);
	text-decoration: none;
}

a.publication_link:hover {
    color: MediumSeaGreen;
	text-decoration: none;
}

/*doi link*/
a.doi_link:link{
    color: rgb(0, 0, 0);
	text-decoration: none;
	font-style: italic;
}

a.doi_link:visited {
    color: rgb(0, 0, 0);
	text-decoration: none;
}

a.doi_link:hover {
    color: MediumSeaGreen;
	text-decoration: none;
}

#bio_image{
	width: 100%;
}

footer {
	background-color: Grey;
    padding: 10px;
    text-align: center;
    color: rgb(240, 240, 240);
}
a.footer_link:link{
	color: rgb(240, 240, 240);
	text-decoration: none;
}

a.footer_link:visited {
    color: rgb(240, 240, 240);
	text-decoration: none;
}

a.footer_link:hover {
    color: rgb(240, 240, 240);
	text-decoration: none;
}

@media screen and (max-width: 500px) {
  #top_bar_name, #nav_list, li, .dropdown-content, .column, .column_image{
    width: 100%; /* The width is 100%, when the viewport is 800px or smaller */
  }
  #heading {
		margin-top: 290px;
  }
  #buffer {
	  margin-top: 290px;
  }
}