Lined paper

<div class="lined-paper">...</div>

.lined-paper {
    /* Lined background */
    background-image: linear-gradient(#d1d5db 1px, transparent 0px);
    background-size: 100% 2em;

    /*
    Display the content on top of the lines.
    The line height must be the same as the background size defined above
    */
    background-position-y: 1.5rem;
    line-height: 2em;
}