Lightning Component used in Lightning Tab is called 'Wizard'. The markup for Spring 18 release looks as follows:
Winter 18 version looks as follows:
The 'slds-card'-styled div which was added in Spring 18 makes the container not transparent any more, the background is white now. Is there an option in setup to deactivate the card-div-wrapper?
Locker service does not allow to access the wrapper element's styling generated by Salesforce.
Update
Workaround right now is to add styles (warning! bad practice to have such selectors, temporary fix):
#brandBand_1 > div > div > div > div.slds-card {
background: transparent;
border: none;
box-shadow: none;
}
in Static Resource named wrapperCardReset
. And then use the resource in the main component:
<ltng:require styles="{!$Resource.wrapperCardReset}"/>