.post {
    max-width: 960px;
}

.postBody h1 {
    background-color: skyblue;
    padding: 10px;
    margin-top: 10px; 
}

.postBody h2 {
    background-color: whitesmoke;
    padding: 5px;
    border: 1px dashed silver;
    margin-top: 5px;
}