Dear @alina-sch
Try Adding the following Code to 'Custom CSS' within 'Lay-options - Custom CSS & HTML':
.sitetitle img { height: 100vh; width: 100vw } .sitetitle,img { object-fit:cover; }The 'cover' will wish to keep the aspect ratio of your image, you can change this to other variants such as 'fill' or 'contain'
https://www.w3schools.com/css/css3_object-fit.asp
https://laytheme.com/documentation.html#custom-css-styling
Hope this helps and have a wonderful day :)
Richard