body {
    margin:0;
    background:#dddddd;
    font-family:'Courier New', Courier, monospace;
}

ul {
    padding:0;
}
ul li {
    list-style-type:none;
}
ul.bullet {
    padding-left:15px;
}
ul.bullet li {
    list-style-type:disc;
}

a {
    text-decoration:none;
    color:#405990;
}
a:hover {
    text-decoration:underline;
}

header {
    position:sticky;
    top:0;
    left:0;
}

h1 {
    text-align:center;
}

#name-banner {
    display:block;
    height:100px;
    line-height:100px;
    background-image:url(Neige.jpg);
    background-size:cover;
    background-color:rgb(110, 120, 133);
    color:black;
    font-size:35px;
    font-weight:bold;
    padding-left:10%;
}

ul.menu {
    background-color:#9a9a9a;
}

ul.menu li {
    text-align:center;
    font-weight:bold;
}

#main-menu {
    width:100%;
    height:50px;
    line-height:50px;
    margin:0;
}

#main-menu li {
    float: left;
    padding-left:5%
}

/* the hidden checkbox used to open the menu */
#menu-button {
    display:none;
}

/* the menu icon made of three horizontal lines */
#menu-icon {
    display: none;
    position: fixed;
    top: 10px;
    right: 10px;
    width: 30px;
    height: 30px;
    z-index: 2; 
    cursor:pointer;
}

#menu-icon .line{
    display: block;
    height: 5px;
    width: 100%;
    border-radius: 10px;
    background: whitesmoke;
}

/* space between the lines */
#menu-icon > .line + .line {
    margin-top: 5px;
}

/* the lines become a cross if the menu is open */
#menu-icon #line1 {
    transform-origin: 100% 0%;
    transition: transform 0.4s ease-in-out;
}

#menu-icon #line2 {
    transition: transform 0.2s ease-in-out;
}
  
#menu-icon #line3 {
    transform-origin: 100% 100%;
    transition: transform 0.4s ease-in-out;
}

#menu-button:checked + #menu-icon #line1 {
    transform: rotate(-45deg);
}

#menu-button:checked + #menu-icon #line2 {
    transform: scaleY(0);
}

#menu-button:checked + #menu-icon #line3 {
    transform: rotate(45deg);
}


/* The menu is hidden from view and we only show it when the button is checked */
/* #hamburger-menu {
    position: fixed;
    top: -16px;
    right: -250px;
    width: 150px;
    height: 100%;
    transition: 0.3s;
} */

/* #hamburger-menu li {
    padding-top: 30px;
} */

/* #menu-button:checked ~ #hamburger-menu {
    right: 0;
} */


/* We add an overlay to grey out the rest of the page when the menu is open */
.overlay{
    visibility:hidden;
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    opacity:0.5;
    overflow:hidden;
    background:black;
    z-index:-1;
}

/* #menu-button:checked ~ .overlay {
    visibility: visible;
} */


main {
    margin:5% 10%;
}

div#presentation, div#research-topic {
    text-align:justify;
}

img#portrait {
    float:right;
    width:30%;
    margin-left:2%;
    margin-bottom:2%;
}

footer {
    border-top: 1px solid black;
    font-size: 14px;
    margin:10%;
    margin-top:7%;
}

.footer-wrapper {
    width:100%;
    display:flex;
    margin:0;
}

.footer-column#contact {
    width:75%;
}

.footer-column#social-media {
    font-size:16px;
}

#last-update {
    margin-top:5%;
    width:100%;
    text-align: center;
    font-size:12px;
}


@media screen and (max-width: 610px) {
    #name-banner {
        font-size: 30px;
    }
    #main-menu {
        font-size:14px;
        padding-left:10px;
    }
    .footer-wrapper {
        display:inline;
    }
    .footer-column#contact {
        width:100%;
    }
}

@media screen and (max-width:510px) {
    #name-banner {
        font-size: 28px;
    }
    #menu-icon {
        display: inline;
    }
    /* The menu is hidden from view and we only show it when the button is checked */
    #main-menu {
        position:fixed;
        top:0;
        right:-200px;
        width:150px;
        height:100%;
        transition:0.3s;
        font-size:16px;
        line-height:normal;
    }
    #main-menu li {
        float:none;
        padding-top:40px;
        padding-left:0;
    }
    #menu-button:checked ~ #main-menu {
        right:0;
    }
    #menu-button:checked ~ .overlay {
        visibility: visible;
    }
    main {
        font-size: 14px;
    }
    .footer-column#social-media {
        font-size: 14px;
    }
}

@media screen and (max-width: 370px) {
    #name-banner {
        font-size: 22px;
        height: 70px;
        line-height: 70px;
    }
    /* footer {
        font-size:12px;
    } */
}