Hey Chris,
the standard value is 310px; the height of the slider does not change depending on the screen in the current version of Tokyo, yet if you’d like it to e.g. become smaller on smaller screens, you can add conditional media queries in CSS, for example:
@media only screen and (max-width: 767px) and (min-width: 480px) {
#main #background-controls { margin-top: 100px !important; }
}
Sincerely,
Andrii / Satori Studio