html {
    background-color: azure;
}

body {
    margin: 0
}

header {
    margin: 2em auto 1em auto;
}

nav {
    text-align: center;
    margin: 1em;
}

nav a {
    margin: 0 0.75em;
    text-decoration: none;
    color: cornflowerblue;

    display: inline-block;
    padding: .5em 1em;
    border: 2px solid midnightblue;
    border-radius: 10px;
}

nav a:link {
    color: cornflowerblue;
}

nav a:visited {
    color: cornflowerblue;
}

nav a:hover {
    background-color: midnightblue;
    color: white;
    text-decoration: none;
}

nav a:active {
    color: midnightblue;
}



.content-box {
    max-width: 800px;
    margin: 2em auto 4em auto;
    padding: 2em;
    background-color: rgba(255, 255, 255, 0.75);
    border: dotted 2px;
    border-color: midnightblue;
}

.content-box h2 {
    margin-top: 0;
}

h1 {
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 3em;
    color: midnightblue;
    margin: 0 auto .5em auto;

}

.course {
    text-align: center;
    font-size: 1.5em;
    color: cornflowerblue;
    font-weight: bold;
    padding: 0;
    margin: 0;
}

h2 {
    text-align: center;
    color: cornflowerblue;
}

#zuke {
    width: 25%;
    display: block;
    margin: 2em auto;

}

p{
    line-height: 1.6;
}

div.list {
    text-align: center;
}

ul {
    display: block;
    text-align: center;
    list-style: none;
    padding: 0;
    margin: 0;
    line-height: 1.6;
}

strong {
    font-weight: bold;
    color: midnightblue;
}

.site-footer {
    text-align: center;
    padding: 2em 1em;
    color: midnightblue;
}