Sometimes the size of the article title in a wordpress theme is not what we expect.
It’s often too big.
We can overcome this by adding css code in the customize menu.
Access through the Appearance menu, then select Customize.
After entering Customize, scroll down and find the Additional CSS menu.
Type the following code and adjust the font size to what you want.

 .single h1.entry-title { font-size: 30px; }

For the example above, I used a size of 30 pixels.