.body { 
    font: 10px Georgia, Arial; 
    width: 450px; 
    margin: 3px auto; 
    border: 3px double gray; 
} 

h1, h2 { 
    padding: 0; 
    margin: 0; 
    display: inline; 
} 
.collapsable { 
    margin: 1em; 
    padding: 1em; 
    border: 1px solid black; 
    background: #eee; 
    
}