h1 pre, h2 pre, h3 pre, h4 pre, h5 pre, h6 pre {
    display: inline;
}

h1 code, h2 code, h3 code, h4 code, h5 code, h6 code {
    display: inline;
}

.strike-through {
    text-decoration: line-through;
    display: inline;
}