#puzzle, #original{
    margin: auto;
    width: 50%;
    text-align: center;
}

input{
    width: 36px;
    text-align: center;
    font-size: 36px;
    border: 1px lightblue dotted;
}

.solved {
    color: goldenrod;
}

.duplicate{
    color: red;
    border: 1px black solid;
    background-color: lightgray;
}

button{
    font-size: 20px;
    background-color: none;
    border: 2px lightskyblue solid;
    padding: 10px;
    margin: 5px;
    text-align: center;
    cursor: pointer;
    outline: none;
    color: MidnightBlue;
    
    border-radius: 15px;
    box-shadow: 0 4px #999;
}

button:hover {
    color: dodgerblue;
}

button:active {
    box-shadow: 0 0px #666;
    transform: translateY(4px);
}

button:disabled {
    box-shadow: 0 0px #666;
    color: #fff;
}

table{
    border-collapse: collapse;
    
    border: 2px dodgerblue solid;
    margin: auto;
}

.border_top{
    border-top: 2px dodgerblue solid;
}

td.border_right{
    border-right: 2px dodgerblue solid;
}