base.css

article, aside, figure, footer, header, main, nav, section {
    display: block; /* https://www.w3schools.com/html/html5_browsers.asp */
}
html {
    /* https://stackoverflow.com/questions/4565942/should-global-css-styles-be-set-on-the-html-element-or-the-body-element */
    background-color: #F1F1FA;
}
body {
    text-align: center;
}
footer, header {
    font-size: 16px;
    padding: 10px 0px;
}
main {
    font-size: 14px;
}
h4 {
    font-size: 16px;
    text-decoration: underline;
}
table {
    margin: 0px auto; /* https://stackoverflow.com/questions/14073188/center-align-a-html-table */
}
#copyright_and_contact_footer, #ece_ntua_header {
    background-color: #82B7EF;
}
#slub_header {
    background-color: #D3D6E6;
}
#session_nav {
    background-color: #82B7EF;
    font-size: 16px;
    padding: 10px 0px;
}