.ShowHide {
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    background-color: yellow;
    color: black;
    padding: 1em;
}

#left {
    text-align: center;
}

#right {
    float: right;
    width: 1em;
    text-align: center;
}

.ShowHide a {
    color: black;
    text-decoration: none;
}

.ShowHide a:hover {
    text-decoration: underline;
}