Editing font that's not specified in theme settings

Hi, on my product pages, the product name and description heading are appearing very small, especially on mobile. How can I make the font for just these two elements larger?

Here is a link to one of my product pages

Theme: Stiletto

Hi @GoodAFpecans ,
Step 1: Go to Shopify Admin → Online Store ->Theme → Edit code

Step 2: Search file base.css, theme.css, styles.css or theme.scss.liquid

Step 3: Insert the below code at the bottom of the file → Save

.product__details .product__title {
    font-size: 36px !important;
}

.product__description .ff-heading {
    font-size: 30px !important;
}

Here is result:

Hope this can help you,

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It worked, thank you!