Slider disappears on phone view

[KBdesign (Katherine Bowers K Bowers)]

Slider working fine on desktop, tablet and landscape phone, but not on portrait phone view.

Have tried just placing in a section with all default values, have tried messing around with slider height, % and mask heigh and %, tired flex, block etc.

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[webdev (Jeff Selser)]

@KBdesign

Slider working fine on desktop, tablet and landscape phone, but not on portrait phone view.

On what device and browser? Details matter so others can test in an environment equivalent to yours.