HowTo Reduce Font Size of Members Name /Username

I use DT. Please take a look at the picture of the Members’ page: I want the name “CMD W/wide Services nig Ltd” to be in one line, so as not to increase the height of the box. I know if I reduce the font size, it will take care of the problem. https://www.maritimebusinessafrica.com/companies/
Can someone please show me how to reduce the font size of the name only. I already tried this:
.profile h1 {
font-weight: normal;
font-size: 17px; !important;
margin: 10px 0 0 0;
}
It did not work. Even without “!important”.
Thank you.
Chidozie