Q:

Can't make the image disappear on small screens with Bootstrap

I have this HTML code that uses Bootstrap and it should make an image disappear on smaller screens.
<img src="_images/header.png" class="visible-lg" alt="header image">

A:

You should explicitly hide rather than display at specific viewport sizes.
If you are using v4, try hidden-sm-down
If you are using previous versions, try hidden-xs hidden-sm
see the documentation for more details 

