how to define size of the media embed link preview

can anyoneplease suggest me a way to alter the size of the mediaembed preview

I think this is hard-coded in the extension @JoshyPHP should be able to answer better.

Best way would be in CSS:

[data-s9e-mediaembed]
{
    max-width: 300px !important;
}

thank you very much guys,i will check it out

Guys,it worked and once again thank you