body {
    margin: 0;
    padding: 0;
    font-size: 1.5em;
    font-family: 'PT Serif';
}

a {
    text-decoration: none;
    color: black;
}
a:hover {
    text-decoration: underline;
}

.small-header {
    font-size: 0.8em;
    color: #aaa;
    font-style: italic;
}

.header {
    padding: 10px;
    color: #aaa;
}

.header hr {
    height: 10px;
    border-width:1px 1px 0 1px;
    border-style: solid;
    border-color: #aaa;
}

.main {
    max-width: 1000px;
    margin: 0 auto;
}

.secondary {
    box-sizing: border-box;
    padding: 20px;
}

.first {
    width: 60%;
    /* background: #eef; */
}

.second {
    width: 40%;
    overflow: hidden;
    max-height: 400px;
    position: relative;
    /* background: #efe; */
}

.hidden-content {
    display: none;
}

.toggle-button {
    cursor: pointer;
}

/* Laptop and larger */
@media only screen and (min-width: 1200px) {

    @media only screen and (max-width: 1399px) {
        body {
            font-size: 1.4em;
        }

        .main {
            margin-left: 200px;
            margin-right: 200px;
        }
    }

    .secondary {
        float: left;
    }
}

/* iPad */
@media only screen and (min-width: 768px) and (max-width: 1199px) {
    body {
        font-size: 1.3em;
    }

    .main {
        margin-left:  67px;
        margin-right: 67px;
    }

    @media only screen and (max-width: 899px) {
        .main {
            width: 766px;
            margin-left: auto;
            margin-right: auto;
        }
    }

    .secondary {
        float: left;
    }
}

/* Smartphones */
@media only screen and (max-width: 767px) {
    .primary {
        display: flex;
        flex-direction: column-reverse;
    }

    .first, .second {
        width: 100%;
    }

    .second {
        max-height: 400px;
        overflow: hidden;
    }

    .hidden-content {
        display: none;
    }

    .toggle-button {
        display: block;
    }
}