div.slide h1 {
    font-size: 140%;
    border-bottom: solid 1px black;
    margin-bottom: 1em;
} 

div.slide.cover h1 {
    border-bottom: none;
} 

div.slide.cover h1 {
    margin-top: 1.2em;
    margin-bottom: 2em;
} 
div.slide.cover h3 {
    color: #555;
    margin-top: 1.5em;
    margin-bottom: 1em;
}