Ooh how about this for an anvil-role
's solution wiith no javascript
theme.css
.anvil-role-alert-form .structure {
height: 100%;
min-height: auto;
}
roles:
code:
from ..Form1 import Form1
my_form_instance = Form1()
my_form_instance.role = "alert-form"
alert(content=my_form_instance, large=True)