remixerView: bound min-height only
videoLinkShell: enlarge video-player to 100% width
timeRangeInputView: set rangeslider to 100% width

bump totalTime counter to second line, augmenting its display with
maxTime
timeRangeInputView: space elements smoothly
timeRangeInputView: add background gradient
rangeSlider: fix borders and curves
rangeSlider: fix thickness of buttons and bar
rangeSlider: smooth colors