How can I adjust the font size on my product page in the Sense theme?

[MrKingstone]

How do I change the size of the title of my products to smaller on theme Sense?? Working in the Sense theme

I tried this:

section#MainProduct-template–15890439405759__main span.price-item.price-item–regular { font-size: 20px; }

In Base.css but nothing changed, somebody know what can i do?

My product page: Product page

[Guleria]

Use this css

.product .product__title h1 {
    font-size: 20px;
}