How to include different fonts?

Question

css

Hello!
Connected 3 fonts RobotoBold, RobotoLight and RobotoThin via googleFonts.
Nothing further :(
Font if you put just Roboto, the browser changes the font
But how to give the element RobotoBold, for example?
Thank you!

Answer 1

.RobotoThin {
    font-family: Roboto;
    font-weight: 100;
}

.RobotoLight {
    font-family: Roboto;
    font-weight: 300;
}

.RobotoBold {
    font-family: Roboto;
    font-weight: 700;
}

Answer 2

google "google fonts"

Answer 3

try to prescribe font-family for each font