html, body {
    margin: 0;
    box-sizing: border-box;
    text-align: center;
}

html {
    /*    font-family: cmu sans serif, sans-serif; */
    font-family: sans-serif;
}

.nav {
    /*  border-bottom: 1px solid #000000; */
    min-height: 50px;
    line-height: 50px;
    color: #ffffff;
    background: #000000;
}

.nav h1 {
    float: left;
    margin: 0 0 0 10px;
    font-size: 20px;
}

.menu {
    margin: 0 30px 0 0;
    text-align: center;
    width: 100%;
    display: none;
    clear: both;
}

.menu a {
    text-decoration: none;
    color: #ffffff;
    background: #000000;
    margin: 0;
    display: block;
    line-height: 40px;
    border-bottom: 1px solid #ffffff;
}
label {
    display: block;
    margin: 10px 20px 0 0;
    font-size: 30px;
    line-height: 30px;
    cursor: pointer;
    width: 30px;
    float: right;
}

#toggle {
    display: none;
}

#toggle:checked + .menu {
    display: block;
}

.content {
    clear: both;
    /*  max-width: 80%; */
    margin: auto;
    padding: 10px;
}

p, ul {
    max-width:40em;
    margin: 10px auto;
    text-align:left;
    font-family: serif;
}