h1, p{
  text-align: center;
}

#octave_bar{
	width: 400px;
	margin: 20px auto ;
}

form {
  margin: 0 auto ;
    max-width: 400px; 
  border: 1px solid #ccc;
  padding: 10px 10px 0;
    text-align: left;
}

form dl {
    display: flex;
    margin: 0;
}

form dt {
    font-weight: bold;
    width: 15%;
}

form dd {
    margin: 0;
    display: inline-block;
    width: 85%;
}

label {
  margin: 0 10px 10px 0;
    display: inline-block;
}

label:hover {
  cursor: pointer;
}

#chord_type_text {
  font-size: 20px;
    margin: 10px 0 0;
}

#chord_keys_text {
    margin: 0 0 10px;
}

#piano {
  background: #333;
  padding: 10px;
  width: 850px;
  display: block;
  margin: 0 auto;
  position: relative;
}

.w_key {
  background: #FFF;
  border: 0px solid #333;
  width: 34px;
  text-align: center;
  padding:  90px 0 10px;
  display: inline-block;
}

.b_key {
  position: absolute;
  z-index: 10;
  top: 10px;
  margin: 0 -17px;
  padding: 0;
  background: #000;
  border: 1px solid #fff;
  color: #fff;
  width: 25px;
  height: 75px;
  text-align: center;
  display: inline-block; 
}

#instruments_div{
  width: 400px;
  margin: 20px auto;
}

#instruments{
  width: 200px;
  margin: auto;
}