You can use the classify plugin to do it.
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List item Install the plugin & enable ID’s (Settings - General - Expose the option to add an ID)
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List item Set the ID of the grey element to: {addClass: “grey”}
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List item Set the ID of the pink element to: {addClass: “pink”}
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List item Then create a html element and paste the following in:
<style> .grey { height: 100vh !important; } .pink { position: fixed !important; top: calc(100vh - 50px) !important; } </style>
Attention: You need to adjust the “50px” to the height of your pink element - I just used 50px as an example.
That should do the trick. However the usability will depend on the elements you are going to put inside these groups.
Hope that helps.