I don't think it is the best approach, but could be considered as an option
Try modifying the left value of the following:
.tabs_inner .tab-content .tab-pane .list:before {
left: 50.5% // was 46%
}
This would fix your issue until the screen size gets lower than 500px. You might have to change the left value again for the lower screen sizes.
Hope this helped!
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