body {
    text-align: center;
}

#header {
    width: 100%;
    text-align: center;
}

#levels {
    padding-top: 0px;
    text-align: center;
}

#controls #levels input {
    width: 30px;
    height: 30px;
    margin-top: 5px;
    font-size: 16px;
    text-align: center;
}

#puzzle {
    width: 400px;
    margin-left: auto;
    margin-right: auto;
}


table {
    border-spacing: 0px;
    border: 2px solid #000000;
    border-collapse: collapse;
}

.inner_table td {
    border: 1px solid #000000;
    width: 40px;
    height: 40px;
    font-size: 22px;
}

table td table td {
    border: 1px solid;

    text-align: center;
}

.selected {
    background-color: #FFE8A6;
}

.fixed {
    background-color: #FFB966;
}

#controls {
    width: 100%;
    text-align: center;
    margin-top: 10px;
}

#controls input {
    width: 100px;
    height: 50px;
}

.mistake {
    color: red;
}

.correct {
    color: blue;
}