/** Mixins **/
/** Base Styles **/
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  font-size: 62.5%;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  font-family: "Roboto", "Myriad Pro", sans-serif;
  line-height: 1;
  background: url("http://i1067.photobucket.com/albums/u422/arnellebalane/background_zpsifao5spd.jpg") center center no-repeat;
  background-size: cover;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}
/** Knob Styles **/
.knob {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 50rem;
  height: 50rem;
  position: relative;
}
.knob-outer {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 33rem;
  height: 33rem;
  position: relative;
  z-index: 1;
  border-radius: 50%;
  background-color: #42444a;
  overflow: hidden;
}
.knob-outer::before {
  content: "";
  position: absolute;
  left: -10rem;
  bottom: 5rem;
  width: 10rem;
  height: 10rem;
  border-radius: 50%;
  box-shadow: 0 0 10rem 10rem #d5a362;
  opacity: 0.25;
}
.knob-inner {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  width: 24rem;
  height: 24rem;
  position: relative;
  border-radius: 50%;
  background-color: #f2f2f2;
  overflow: hidden;
}
.knob-value {
  width: 12rem;
  height: 12rem;
  margin: 2rem 0;
  position: relative;
  z-index: 1;
  font-size: 6rem;
  font-weight: 100;
  text-align: center;
  line-height: 12rem;
  color: #71727b;
  border-radius: 50%;
  background-color: #fff;
}
.knob-value-progress {
  height: 0;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #d8e3ea;
  transition: height 500ms ease-out;
}
.knob-arrow {
  width: 4rem;
  height: 1.5rem;
  position: relative;
  z-index: 1;
  cursor: pointer;
  outline: none;
}
.knob-arrow::before,
.knob-arrow::after {
  content: "";
  width: 2.4rem;
  height: 3px;
  position: absolute;
  top: 0;
  left: 50%;
  background-color: #ccc;
  transform-origin: left center;
  transform: rotate(30deg);
}
.knob-arrow::after {
  transform: rotate(150deg);
}
.knob-arrow.down::before,
.knob-arrow.down::after {
  top: auto;
  bottom: 0;
  transform: rotate(-30deg);
}
.knob-arrow.down::after {
  transform: rotate(-150deg);
}
.knob-indicator {
  width: 1rem;
  height: 1rem;
  border: 1px solid #fff;
  position: absolute;
  top: calc(50% - 0.5rem);
  left: calc(50% - 0.5rem);
  z-index: 1;
  border-radius: 50%;
  cursor: pointer;
  transition: background-color 250ms ease-out;
}
.knob-indicator:hover {
  background-color: #fff;
}
.progress-label {
  width: 10rem;
  position: absolute;
  top: 50%;
  font-size: 1.4rem;
  text-align: center;
  text-transform: uppercase;
  color: #a0a2a9;
}
.progress-label.contrast {
  left: -2.5rem;
  transform: rotate(-90deg);
}
.progress-label.brightness {
  right: -2.5rem;
  transform: rotate(90deg);
}
/** Progress Bars Styles **/
.progress-bars {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}
.progress-bars path {
  stroke-dashoffset: 605;
  transition: stroke-dashoffset 500ms ease-out;
}