body {
    font-family: Roboto, Arial, Helvetica, sans-serif;
    background-color: black;
    color: white;
    width: 1000px;
    margin: 0 auto;
    overflow: hidden;
    clear: both;
}

#InstrumentInfo {
    display: block;
    font-family: sans-serif;
    text-align: left;
    margin: 10px 0px;
}

#InstrumentTitle {
    font-size: 64px;
}

#InstrumentDescription {
    display: block;
    margin-top: 20px;
}

#Hint {
    font-size: 12px;
    border: 10px;
    margin: 10px;
    float: left;
}

/*---------------------------------------------------------------------------*/

.note_play {
    border: 1px solid green;
    background-color: rgba(0, 255, 0, 0.1);
    position: absolute;
}

.note_stop {
    border: 1px solid blue;
    background-color: rgba(0, 0, 255, 0.1);
    position: absolute;
}

.note_invisible {
    border: 0px;
    background-color: transparent;
    position: absolute;
}

.label {
    color: orange;
    font-size: 16pt;
    text-align: center;
    position: absolute;
}

.label_invisible {
    border: 0px;
    visibility: hidden;
    position: absolute;
}

.key {
    color: rgba(127, 255, 255, 0.75);
    font-size: 16pt;
    text-align: center;
    vertical-align: bottom;
    position: absolute;
}

.key_invisible {
    border: 0px;
    color: transparent;
    position: absolute;
}

.nav {
    overflow: hidden;
}

.nav a {
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    float: left;
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
}

.nav a:hover {
    border-bottom: .25rem solid;
}

.nav a.active {
    border-bottom: .25rem solid;
}

/*---------------------------------------------------------------------------*/