controls.css

/**
 * Copyright 2015 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#videoContainer {
  width: 600px;
  height: 400px;
  position: relative;

  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-justify-content: flex-end;
  justify-content: flex-end;
  -webkit-align-items: center;
  align-items: center;

  background-color: black;
}

#video {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

#bufferingSpinner {
  margin: auto;
  z-index: 1;
  width: 50px;
  height: 50px;
  background-size: 50px;
  background-image: url('assets/controls/buffering.gif');

  display: none;

  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}

#videoControlsEnclosure {
  width: 100%;
  max-width: 800px;
  height: 35px;
  padding: 0 5px;
  margin: 0 0 5px;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
  box-sizing: border-box;
}

#videoControls {
  position: relative;
  height: 35px;
  margin: 0;
  padding: 0 0 0 7px;

  background-color: rgba(20, 20, 20, 0.8);
  border-radius: 5px;

  display: -webkit-flex;
  display: flex;

  -webkit-flex-direction: row;
  flex-direction: row;
  -webkit-justify-content: center;
  justify-content: center;
  -webkit-align-items: center;
  align-items: center;

  opacity: 0;
  transition: opacity 0.3s;
}

#videoContainer:hover #videoControls {
  opacity: 1;
}

#playButton, #pauseButton, #muteButton, #unmuteButton, #fullscreenButton {
  height: 32px;
  width: 32px;
  padding: 0;
  margin: 0 7px 0 0;
  background: transparent;
  border: 0;
  outline: none;
}

#playButton {
  background-image: url('assets/controls/play.png');
}

#playButton:active {
  background-image: url('assets/controls/play-active.png');
}

#pauseButton {
  display: none;
  background-image: url('assets/controls/pause.png');
}

#pauseButton:active {
  background-image: url('assets/controls/pause-active.png');
}

#muteButton {
  background-image: url('assets/controls/mute.png');
}

#muteButton:active {
  background-image: url('assets/controls/mute-active.png');
}

#unmuteButton {
  display: none;
  background-image: url('assets/controls/unmute.png');
}

#unmuteButton:active {
  background-image: url('assets/controls/unmute-active.png');
}

#fullscreenButton {
  background-image: url('assets/controls/fullscreen.png');
}

#fullscreenButton:active {
  background-image: url('assets/controls/fullscreen-active.png');
}

#currentTime {
  display: -webkit-flex;
  display: flex;
  -webkit-flex-grow: 0;
  flex-grow: 0;
  margin: 0 9px 0 0;
  font-family: sans-serif;
  font-size: 13px;
  font-weight: bold;
  color: white;
}

/* NOTE: pseudo-elements for different browsers can't be combined with commas.
 * Browsers will ignore styles if any pseudo-element in the list is unknown.
 */

/* main range element */
#seekBar, #volumeBar {
  display: -webkit-flex;
  display: flex;
  height: 7px;
  margin: 0 12px 0 0;
  padding: 0;

  /* removes webkit default styling */
  -webkit-appearance: none;

  border: 1px solid #666;
  border-radius: 4px;
  background-color: black;
  outline: none;
}
/* removes mozilla default styling */
#seekBar::-moz-range-track, #volumeBar::-moz-range-track {
  background-color: transparent;
  outline: none;
}
/* per-instance styles */
#seekBar {
  -webkit-flex-grow: 1;
  flex-grow: 1;
}
#volumeBar {
  -webkit-flex-grow: 0;
  flex-grow: 0;
  min-width: 15px;
  max-width: 70px;
}


/* thumb pseudo-element, common style */
#seekBar::-webkit-slider-thumb, #volumeBar::-webkit-slider-thumb {
  -webkit-appearance: none;
  background-color: white;
  outline: none;
}
#seekBar::-moz-range-thumb, #volumeBar::-moz-range-thumb {
  background-color: white;
  outline: none;
}

/* thumb pseudo-element, seek style */
#seekBar::-webkit-slider-thumb {
  width: 18px;
  height: 11px;
  border-radius: 8px;
}
#seekBar::-moz-range-thumb {
  width: 18px;
  height: 11px;
  border-radius: 8px;
}

/* thumb pseudo-element, volume style */
#volumeBar::-webkit-slider-thumb {
  width: 12px;
  height: 12px;
  border-radius: 12px;
}
#volumeBar::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 12px;
}