Why element disappears after adding it to an existing DOM?

Trying to create a control panel for the video player. The problem is, it is not enough that the panel has absolute positioning, so also the slider for sound. Thus, when I inserted it in the panel, the rim disappears, leaving only the button of the slider. Tell me what could be the problem? Here is a link to compen codepen.io/eljlive/pen/woKEPd?editors=1100
July 2nd 19 at 18:07
1 answer
July 2nd 19 at 18:09
View your compiled css.
.rangeslider.rangeslider-vertical {
 margin: 20px auto;
 height: 150px;
 max-width: 4px;

Positioning is not spelled out.
Absolute positioning counts your coordinates from the first parent with a positioning different from static.
I tried to manipulate the positioning. I'm not very helpful. More precisely at all did not help) If you have the opportunity to RUB my nose in something that needs to be corrected, do so please) - alexandre.Hermann commented on July 2nd 19 at 18:12

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