Sugestions

Thank you for the suggestion! I’ve intentionally not included mobile styling, except to remove the visual labels (if that setting is selected), to try to keep the plugin styles as neutral as possible, so that users can override fairly easily. If you want specific mobile styling, I recommend adding it to your theme, or to the Additional CSS panel in the Customizer.

For your other question, you could add some CSS like this, possibly, within the media query you have above:

.scriptlesssocialsharing {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    width: 100%;
    top: auto;
    margin: 0;
}

It may still need to be adjusted beyond that, but may be a good starting point. Hope that helps.

Hi
Sorry for come here too late.
Thx you for pointing to the rigth way, I have managed to show it as a bottom bar with this code:

@media (max-width: 768px)
.scriptlesssocialsharing__buttons {
    display: flex;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    flex-shrink: 0;
    bottom: 0;
    position: fixed;
}