CSS doesn't seem to work

I have declared Custom CSS under Apperance. Both classes are defined in Image component.

.appIcon {
height: 50px;
width: 50px;

.voltageImage {
height: 100px;
width: 100px;

The class .appIcon works fine and yet .voltageImage doesn’t work. The image simply disappeared after declaring the CSS.

Would anyone know why?

Can you show us what component are you using to display voltageImage?

it’s an image component.

If you use 50px for that, would it show?

Have tried varies sizes but didn’t seem to work. at the end, I just let it be (original size).