In my theme, I'm trying to get the logo on the logon screen to appear bigger

Server
1

owncloud 10.0.8, redhat 7, php7.1, apache2.4

I am trying to create my own theme for owncloud.

I have a large image that I want to have appear above the login prompt. I’ve set up a theme and I can see in the file core/css/styles.css, I can replace the …/img/logo.svg in the below code with my image to get it to appear on the logon screen, but it’s much smaller than I want.

How do I make the image appear larger?

eg in styles.css

/* use logos from theme */
#header .logo {
background-image: url(’…/img/logo.svg’);
width: 250px;
height: 121px;
}