@charset "utf-8";
body {
    background-color: #0f3e88;
    font-family: Verdana, Geneva, sans-serif;
    color: #ffffff;
    margin: 0;
    width: 90%;
    margin-left: auto;
    margin-right: auto;
}

header {
    text-align: center;
    padding: 20px;
}

h1 {
    text-shadow: 4px 6px 5px gray;
}

h2 {
    font-size: 1.3em;
    text-shadow: 4px 6px 5px gray;
}

nav {
    background-color: rgb(14, 42, 87);
    padding: 15px;
    text-align: center;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

nav li {
    display: block;
    width: 20%;
    float: left;
}

nav a {
    display: block;
    background-color: rgb(14, 42, 87);
    line-height: 2.8em;
    text-decoration: none;
    text-align: center;
    padding: 10px;
    color: rgb(224, 224, 227);
}

nav a:hover {
    text-decoration: underline;
    background-color: #0f3e88;
    color: yellow;
}

main {
    background-color: #0b429a;
    margin-top: 35px;
    padding: 20px;
}

main > img {
    float: right;
    width: 25%;
    padding: 25px;
}

main > ul {
    list-style-type: square;
}

header img {
    width: 100%;
}

body > footer {
    background-color: #0b429a;
    color: rgba(102, 102, 102, 0.6);
    font-weight: bold;
    font-size: 0.9em;
    line-height: 3em;
    text-align: center;
    margin-top: 10px;
    padding: 10px;
    clear: both;
}

.gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.gallery img {
    width: 100%;
    border-radius: 8px;
}

@media only screen and (max-width: 768px) {

    body {
        width: 100%;
        margin: 0;
    }

    nav li {
        float: none;
        font-size: x-large;
        width: 100%;
    }

    nav a {
        border-bottom: 1px solid black;
    }

    nav ul {
        display: none;
    }

    #navicon {
        display: block;
        background-color: rgb(14, 42, 87);
        padding: 10px;
        text-align: center;
        font-size: 2em;
        cursor: pointer;
    }

    #navicon:hover + ul,
    nav ul:hover {
        display: block;
    }

    main > img {
        width: 90%;
        float: none;
        padding: 10px 0;
    }

    .gallery img {
        width: 100%;
    }
}

@media only screen and (min-width: 481px) and (max-width: 768px) {
    .gallery img {
        width: calc(50% - 20px);
    }
}

@media only screen and (min-width: 769px) {
    html {
        background-image: url("background.jpeg");
        background-repeat: no-repeat;
        background-size: cover;
        background-position: center;
    }

    .gallery img {
        width: calc(25% - 20px);
    }
}