h1 {
    padding-left:20px;
    font-size: 40px;
    color:#424242;
    margin-bottom: 20px;
}
h2 {
    padding-left:20px;
    font-size: 30px;
    color:#424242;
    Padding-right:10px;
    margin-bottom: 10px;
}
h3 {
    margin-top: 0px;
    padding-left:20px;
    font-size: 30px;
    color:rgb(238, 240, 243);;
    Padding-right:10px;
    padding-top: 20px;
    margin-bottom: 15px;
}
p {
    padding-right:20px;
    font-size: 20px;
    color:#424242;
    padding-left:20px;
    margin: 0px;
}
a {
    color:#424242;
}
a:hover {
    color:rgb(0, 0, 0);
}
body {
    margin: 0px;
    font-family: arial;
}
.topnav {
  overflow: hidden;
  background-color: #000000;
}
    .topnav a {
        float: left;
        text-align: center;
        padding: 10px 10px;
        font-size: 25px;
        color:#ffffff;
    }
.dropdown{
    float:left;
    overflow: hidden;
}
.dropdown .dropbtn {
    font-size: 20px;
    border: none;
    outline: none;
    color:#ffffff;
    margin: 0;
    background-color:#000000;
}
.droplist {
    overflow:hidden;
    background-color: #000000;
    display: none;
    position:absolute;
    min-width: 60px;

}
.droplist a {
    float: left;
    text-align: center;
    padding: 10px 10px;
    font-size: 25px;
    color:#ffffff;
    display:block
}
.droplist a:hover {
    background-color: #424242;
}
.dropdown:hover .droplist {
    display: block;
  }
.topnav a:hover, .dropdown:hover .dropbtn {
    background-color: #424242;
    overflow: hidden;
}

.float {
    overflow:auto;
  }
  .float div {  
    width:50%;
    float:left;
  }
.img {
    display: block;
    margin-left: auto;
    margin-right: auto;
}
.Diagram {
    float: left;
    width:50%;
    width:500;
    height:500;
}
.Citations {
    background-color: rgb(0, 0, 0);
}