* {
    font-family: sans-serif;
}

body {
    margin:0;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

ul.navbar-nav {
    flex-direction: row;
    text-align: center;
    height: 100%;
}

ul.navbar-nav>li {
    width: 25%;
    float: left;
    line-height: 96px;
    font-size: x-large;
}

ul.navbar-nav a {
    padding: 0;
    color: #101010;
    text-decoration: none;
}

ul.navbar-nav>li.dropdown>div.dropdown-menu {
    margin: 0;
}

ul.navbar-nav>li.dropdown:hover>div.dropdown-menu {
    display: block;
    border-color: black;
    padding: 0;
    border-top: none;
    border-radius: 0px 0px 3% 3%;
}

ul.navbar-nav>li.dropdown>div.dropdown-menu>a.dropdown-item {
    text-align: center;
    height: 2em;
    line-height: 2em;
}

.hidden {
    visibility: hidden;
}

header {
    width: 100%;
    height: 96px;
    border-bottom: outset blue 1px;
    background-color: #ffcc00;
    color: #101010
}

header>a {
    float: left;
    width: 25%;
    height: 100%;
}

header>a>picture {
    height:100%;
    display: flex;
}

header>a>picture>img {
    
    object-fit: contain;
}

nav {
    width: 75%;
    height: 100%;
    float: left;
}

.menu {
    list-style: none;
    padding-left: 0;
    margin: 0;
    height: 100%;
}

main {
    width: 80%;
    border: outset blue 1px;
    border-radius: 10px 10px 10px 10px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 20px;
    margin-bottom: 20px;
    padding: 10px;
}

main>section>p {
    text-indent: 2em;
}

main>section>h2::before {
    content: "►";
}

footer {
    border-top: outset blue 1px;
    color: gray;
    background-color: #ffcc00;
    text-align: center;
}

footer>p {
    margin: 0;
}

footer>p>a {
    color: gray;
}

footer>p>a:hover {
    color: gray;
    text-decoration: dashed;
}

.img-fluid {
    margin: auto;
}
  

@media (orientation: portrait), (max-width: 1000px) {
    header>a {
        width: 90px;
    }

    header>nav {
        width: calc(calc(100%) - 90px);
    }
}