/* custom.css */
div.sphinxsidebar {
    font-size: 13px;  /* Change this to your desired size */
}

div.sphinxsidebar h1,
div.sphinxsidebar h2 {
    font-size: 13px;  /* You can customize headings separately */
}

div.sphinxsidebar h3,
div.sphinxsidebar h4 {
    font-size: 13px;  /* You can customize headings separately */
}