@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville&display=swap');

* {
    margin: 0;
    padding: 0;
    color: #6FB98F;
} 

html {
    background-image: url(img/webb-dark.png);
}

p, a, pre, span{
    color: #6FB98F;
    word-wrap: break-word;
    font-family: 'Libre Baskerville', serif;
    font-size: large;
    font-size: 30px;
}

h1, h2, h3, h4{
    color: #6FB98F;
    word-wrap: break-word;
    font-family: 'Libre Baskerville', serif;
    font-size: 60px;
}

pre {
    display: inline;
}

main {
    margin: auto;
    width: 1600px;
    background-color: #021C1E;
    padding: 5px;
}

nav a {
    position: relative;
    text-decoration: none;
    background-color: #2C7873;
    border: 0px;
    padding: 10px;
    margin: 3px 3px 0px 0px;
}

div#navigation {
    position: fixed;
    margin: 10px 0px 10px 0px;
    top: -10px;
    z-index: 999999;
    background-color: #021C1E;
    padding: 20px 00px 10px 0px;
}

nav a {
    font-size: 40px;
}

nav {
    width: 1600px;
}

div#content {
    position: relative;
    margin-top: 80px;
}

div#header {
    float: left;
    width: auto;
}

div#article {
    clear: both;
}

a.selected {
    background-color: #004445;
}

ul#pages a {
    text-decoration: none;
    background-color:#004445;
}

ul#pages a:hover {
    text-decoration: underline;
    background-color: #021C1E;
}

ul#pages li {
    margin: 2px;
    border: 0px solid black;
    padding: 3px;
    background-color: #004445;
}

ul#pages {
    margin-top: 10px;
    list-style: none;
}

form#options {
    border: #2C7873 2px solid;
    padding-left: 3px;
}

.s1 {
    list-style: none;
}

span {
    word-wrap: break-word;
}

div#contents {
    border: 2px solid #2C7873;
    padding-left: 3px;
    margin-bottom: 10px;
} 

.math {
    background-color: #021C1E;
    background: #000;
    padding: 5px;
    margin: 10px;
    -webkit-filter: opacity(.5) drop-shadow(0 0 0 #6FB98F);
    filter: opacity(.5) drop-shadow(0 0 0 #6FB98F);
}

.thsnd {
    width: 1000px;
}

a.anchor {
    display: block;
    position: relative;
    top: -250px;
    visibility: hidden;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    padding-top: 0;
    height: 0;
    overflow: hidden;
}

.video-container iframe,
.video-container object,
.video-container embed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}



@media (max-width: 1610px) and (min-width: 1380px){
    main {
        margin: auto;
        width: 1350px;
    }

    div#content {
        position: relative;
        margin-top: 80px;
        width: 1345px;
    }

    div#navigation {
        width: 1330px;
    }
}

@media (max-width: 1380px){
    html {
        background-image: none;
        background-color: #021C1E;
    }

    main {
        margin: auto;
        width: 90%;
    }

    p, a, pre, span{
        color: #6FB98F;
        word-wrap: break-word;
        font-family: 'Libre Baskerville', serif;
        font-size: 30px;
    }

    nav a {
        font-size: 0%;
    }

    .thsnd{
        width: 80%;
    }

    h1, h2, h3, h4{
        color: #6FB98F;
        word-wrap: break-word;
        font-family: 'Libre Baskerville', serif;
        font-size: 45px;
    }

    .mathml_0 {
        font-size: 30px;
    }

    .mathml_1 {
        font-size: 14px;
    }
}
/*#021C1E; #004445; #2C7873; #6FB98F*/