.chordSelector {
    font-size: 16px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid gray;
    padding: 10px;
    background-color: white;
    color: black;
    min-width: 330px;
    z-index: 150;
}

.chordSelector input[type="button"] {
    font-size: 16px;
    max-width: 100px;
    align-self: center;
}

.chordSelector label {
    font-size: 16px;
    height: 24px;
    display: table-cell;
}

.chordSelector select {
    font-size: 16px;
    box-sizing: border-box;
    height: 24px;
    display: table-cell;
    width: 100%;
}

.chordSelector option {
    box-sizing: border-box;
    font-size: 16px;
}

.chordSelector input {
    box-sizing: border-box;
    font-size: 16px;
    height: 24px;
    display: table-cell;
    width: 100%;
}

.chordSelector canvas {
    width: 100%;
    height: 100%;
}

.chordSelector div {
    display: table;
    width: 100%;
}

.chordSelector td {
    border-collapse: collapse;
    width: 25%;
}

.chordSelector table {
    border-collapse: collapse;
}

.posCell {
    text-align: center;    
}

.headerCell {
    background-image: url('images/fretboard.jpg');
    background-repeat: no-repeat;
    padding: 0px;
    font-weight: bold;
}

.fretCell {
    background-image: url('images/fretboard.jpg');
    background-repeat: no-repeat;
    padding: 0px;
    text-align: center;
    font-weight: bold;
    color: red;
}

.invalidInput {
    background-color: red;
}