Webframe card looks bad

Add-ons UIs
1

I’d like to integrate a webpage in my OH-setting. As far as I know, the webframe card is to be used for that. However, the result is somewhat dissatisfactory:
A part of the top is missing (which I would need to change some settings), it’s black and white and the space is poorly used even if I increase height.
Original website:

image
image2441×1299 288 KB

And what if looks like in OH:

image
image2926×1733 293 KB

Here’s the YAML-Code (didn’t change anything but the height)

config:
  label: z_openWB
blocks:
  - component: oh-block
    config: {}
    slots:
      default:
        - component: oh-grid-row
          config: {}
          slots:
            default:
              - component: oh-grid-col
                config: {}
                slots:
                  default:
                    - component: oh-webframe-card
                      config:
                        src: http://192.168.178.56/openWB/web/index.php
                        height: 1500
masonry: null