Background-size invalid property

Hi, I am trying to set up an image in my css code, but i get an error saying that background-size is an invalid property value.Does anyone possibly know why this is?
Thanks

#main-image
{
    width: 90%;
    height: 100%;
    background-image: url("/challenge1-NFT-card/images/image-equilibrium.jpg");
    background-size: fit;
    background-position: center;
    background-repeat: no-repeat;
    border-radius: 3vh;
    margin-top: 2vh;
    align-self: center;
}

The error is telling you why. Fit is not a valid value for background-size

Here is a list of values that are valid

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