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I would like to place a div element with the bottom half over an other div element. You can see a simple markup here

If you enable the transform property for .overlay then the element is pushed half way down but also the white space of the parent container is visible. Is there any chance to avoid this and get a solution without any space before the dark-gray div? I also would like to avoid to set a negative margin-top if perhaps there is a better solution.

This markup isnt fix, it can be changed if it is necessary.

Ok, here’s the story: I work for a company that recycles hazardous liquid chemicals into useful chemicals. Part of this process involves moving these materials from one tank to another as each part of the recycling process is complete. These tanks are either in our tank farm, part of the distillation system, in rail cars, or tanker trucks. The task I was assigned was to write a query that will allow the manager to pick up with any tank and follow the movement of that material through every tank until it is disposed of or sold. The database was built some 10 years ago, before my time, so the data is all I have to work with (i.e. can’t change it to make it easier to work with).

Now the table structure: the columns that lend themselves to this endeavor are:

• SouceTank
• OpenDate (The day the empty tank starts receiving material)
• CosedDate (The date the tank is closed, emptied, and made ready for new material)
• DestinationTank (The tank the material was moved to)
• ProductName (I add this to validate movements. Many materials can’t be mixed. Some are. The ones that can’t be mixed could show a problem if the algorithm is not working correctly.)

All tanks will have an OpenDate but tanks still being filled or waiting to be shipped out would not have a closed date. Mostly, tanks are chemical agnostic -as in, any empty tank can be used for any chemical. Anywhere from 1 to 10 movements can be expected.

I tried using a recursive CTE T-SQL algorithm but quickly got lost trying to match the SourceTank to the matching DestinationTank where the CosedDate of the SourceTank was between the OpenDate and CosedDate of the DestinationTank, or at least after or equal to the OpenDate of the DestinationTank if it has yet to be closed.

Sample data: