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Description
Is your feature request related to a problem? Please describe.
When a long mail is displayed, the footer (.reply-buttons) isn't visible. When scrolling down, the header (.envelope__header) disappears.
Describe the solution you'd like
Remove "overflow: auto" from .splitpanes.default-theme .splitpanes__pane-details .app-content-wrapper.
Instead activate scrolling on #mail-content.
Describe alternatives you've considered
No response
Additional context
No response