html,body{ margin:0; padding:0; height:100%; width:100%; }

body {
  font-family: 'Roboto', sans-serif;  
  background-color: #252525;
}

.hidden {
  display:none;
}

#circle {
  width: 100vw; 
  height: 100vw; 
  max-height: 100vh;
  max-width: 100vh; 
  margin: auto;
  position: absolute;
  overflow: hidden;
  top:0;bottom:0; /* vertical center */
  left:0;right:0; /* horizontal center */
}

#circle-background {
  background-color: #000000;
  position: absolute;
  width: 100vw; 
  height: 100vw; 
  max-height: 100vh;
  max-width: 100vh; 
  border-radius: 50%;
}

.section-outer {
  position: absolute;
  width: 100vw; 
  height: 100vw; 
  max-height: 100vh;
  max-width: 100vh; 
  border-radius: 50%;
  /*clip: rect(0px, 982px, 982px, 491px);*/
}

 .section-inner {
  position: absolute;
  width: 100vw; 
  height: 100vw; 
  max-height: 100vh;
  max-width: 100vh; 
  border-radius: 50%;
  /*clip: rect(0px, 491px, 982px, 0px);*/
}

.section-outer:nth-of-type(even) .section-inner {
  background-color: #B7CBE0;
}

.section-outer:nth-of-type(odd) .section-inner {
  background-color: #AAAAAA;
}

.key {
  text-align: center;
  /*padding: 80px 90px 0 0;*/
  z-index: 13;
  color: #252525;
  transform: rotate(-16deg);
  font-size: 25px;
}

#chord-area {
  width: 100vw; 
  height: 100vw; 
  max-height: 100vh;
  max-width: 100vh; 
  margin: auto;
  position: absolute;
  overflow: hidden;
  top:0;bottom:0; /* vertical center */
  left:0;right:0; /* horizontal center */
  z-index: 25;
  background: rgba(1, 1, 1, 0.5);
}

.inner-chord-area {
  position: absolute;
  width: 80%; 
  height: 80%; 
  z-index: 100;
  color: #BBBBBB;
  font-size: 30px;
  margin: 10%;
}

@media all and (max-width: 700px) {
  .inner-chord-area {
    font-size: 15px;
  }
}

.inner-chord-area:nth-of-type(1) {
  /*display: block;*/
}

.inner-chord-area > .bar {
  display: inline-block;
  width: 25%;
  height: 16.66%;
}