Resizing gif on lock screen

Site URL: https://www.madebykubeba.com

Hi! Is there a way to enlarge my gif on my lock screen, approximately 2x the size? It is very tiny even the though actual gif is quite large. 

Also I already have things written in my CSS , so would I add it at the end or beginning ? Sorry I am a complete beginner at CSS!!

The logo is currently 60px. You should be able to change it to 120px by adding the following to Settings > Advanced > Code Injection > Lock Page.

<style>
.sqs-slide-wrapper[data-slide-type="lock-screen"] [data-compound-type="logo"][data-slice-type="image"] {
    max-height: 120px!important;
}
.sqs-slide-wrapper[data-slide-type="lock-screen"] [data-compound-type="logo"][data-slice-type="image"] img {
    max-height: 120px!important;
}
</style>