* {
    margin: 0;
    padding: 0;
}

html {
    width: 100%;
    height: 100%;
}

body {
    background-color: #05000a;
    width: 100%;
    height: 100%;
    color: #F9FFF6;
    font-weight:lighter;
    font-family: Arial, Helvetica, sans-serif;
    background-image: linear-gradient( rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 0.75) ), url("background.png");
    background-size: cover;
    background-repeat: no-repeat;
}

header {
    position: relative;
    width: 100%;
    height: 10%;
    background-color: #03000c;
    border-bottom: #C9E265;
}

header .left{
    width: 45%;
    height: 100%;
    float: left;
    font-size: 2em;
    font-weight: bold;
}

header .left img {
    height: 100%;
    vertical-align: middle;
}

header .right{
    width: 15%;
    margin-right: 5%;
    height: 100%;
    float: right;
}

#dropdown + #dropped{
    opacity: 0;
    visibility: hidden;
    transition: 0.5s ease-in all;
    background-color: #C9E265;
}

#dropdown {
    height: 100%;
    background-color: #C9E265;
    color: black;
    display: flex;
    justify-content: center;
    align-items: center;
}

#dropdown:hover {
    cursor: pointer;
}

#dropdown:hover + #dropped{
    position: relative;
    visibility: visible;
    opacity: 1;
}

#dropdown + #dropped:hover{
    position: relative;
    visibility: visible;
    opacity: 1;
    cursor: pointer;
}

#dropped p{
    text-align: center;
    padding: 2% 0;
    color: black;
    border-bottom: 1px solid black;
}

#dropped p:first-child{
    border-top: 1px solid black;
}

.selected {
    background-color: #A6E232;
}

#dropped p:hover {
    background-color: #A6E232;
}

#body-home {
    height: 50%;
    width: 75%;
    text-align: center;
    margin: 0 auto;
    position: relative;
    top:50%;
    bottom: 50%;
    transform: translateY(-50%);
}

#body-about {
    height: 50%;
    width: 75%;
    text-align: center;
    margin: 0 auto;
    position: relative;
    top:50%;
    bottom: 50%;
    transform: translateY(-50%);
}

#body-surveys {
    height: 50%;
    width: 75%;
    text-align: center;
    margin: 0 auto;
    position: relative;
    top:50%;
    bottom: 50%;
    transform: translateY(-50%);
}

#body-references {
    height: 50%;
    width: 75%;
    text-align: center;
    margin: 0 auto;
    position: relative;
    top:50%;
    bottom: 50%;
    transform: translateY(-50%);
}

#body-references a{
    color:#F9FFF6;
    text-decoration: none;
}

#body-about p{
    font-size: 1.5em;
}

#body-surveys p{
    font-size: 1.5em;
}

#body-surveys a {
    padding: 5px;
    color: black;
    text-decoration: none;
    background-color: #C9E265;
    transition: all 0.3s ease-in;
}

#body-surveys a:hover{
    background-color: black;
    color: #C9E265;
    border: #C9E265 1px solid;
}

.hidden {
    visibility: hidden !important; 
    position: absolute !important;
    top: -100% !important;
    left: -100% !important;
}

.shown {
    visibility: visible;
    position: relative;
    top: 0;
    left: 0;
}

footer{
    position:absolute;
    bottom: 0;
    height: 10%;
    width: 100%;
    background-color: #03000c;
    display: flex;
    align-items: center;
    justify-content: center;
}

footer div {
    text-align: center;
    font-weight: bold;
}