Logo

I’m trying to use the below .css code given by the theme author
.site-title a {
background: url(‘https://vinns.in/wp1/wp-content/themes/expound-child/logo.png’) 0 0 no-repeat;
width: 400px;
height: 90px;
text-indent: -9999px;
}
But its not working, Am I missing something? I have added the above in child theme’s, stlye.css