Change Product Title font size

[takeoverapparel]

I want to change the size/have one line of text for the product title. I don't want to reduce the size of every product title, just the ones that break into multiple lines. So the product titles I want the font size to be reduced/one line of text include the Green Monster TakeOver Hoodie, Red Monster TakeOver hoodie, Light Blue Nylon Shorts, Be A Monster Movie Crewneck Sweatshirt, and Sleeveless "Panther Tee." My website is www.takeoverapparel.com, and my password is takeover. I'm using shopify dawn theme

[takeoverapparel]

[takeoverapparel]

that didnt work and i dont want it on all products

[takeoverapparel]

I added everything I wanted in the initial question. For the product titles, I want the font size to be reduced to one line of text. These products include the Green Monster TakeOver Hoodie, Red Monster TakeOver Hoodie, Light Blue Nylon Shorts, Be A Monster Movie Crewneck Sweatshirt, and Sleeveless "Panther Tee."

[topnewyork]

Hello, @takeoverapparel 

1) Go to Online Store
2) Edit Code
3) Find theme.css/base.css file
4) Add the following code in the bottom

@media only screen and (min-width: 750px) {
    h1, .h1 {
        font-size: 18px !important;
    }

@media only screen and (max-width: 768px) {
    #shopify-section-template--18239944261784__main h1 {
        font-size: 19px !important;
    }
}

 Thanks!