.sudInputBox {
    background-color: #303030;
    border-color: white;
    color: white;
    font-family: Consolas;
    font-size: 25px;
    height: 36px;
    width: 36px;
    text-align: center;
    padding: 0;
    border: 1px solid #555; /* Flat border */
    box-shadow: none; /* Remove inner/outer shadows */
    appearance: none; /* Remove browser styling (Chrome, Safari) */
    -webkit-appearance: none; /* Remove WebKit default styles */
    -moz-appearance: none; /* Remove Firefox default styles */

    outline: none; /* Optional: remove focus border */
    border-radius: 0; /* Optional: remove rounded corners */
}

    .sudInputBox:hover,
    .sudInputBox:focus {
        border-color: #888;
        background-color: black;
    }

.sudInputBox_Error {
    background-color: #A00E0E;
    border-color: white;
    color: white;
    font-family: Consolas;
    font-size: 19px;
    height: 36px;
    width: 36px;
    text-align: center;
    padding: 0;
    border: 1px solid #555; /* Flat border */
    box-shadow: none; /* Remove inner/outer shadows */
    appearance: none; /* Remove browser styling (Chrome, Safari) */
    -webkit-appearance: none; /* Remove WebKit default styles */
    -moz-appearance: none; /* Remove Firefox default styles */

    outline: none; /* Optional: remove focus border */
    border-radius: 0; /* Optional: remove rounded corners */
}

.diagonal-cell {
    background-color: black;
    color: white;
    font-size: 22px;
}

.hyperblock-cell {
    background-color: black;
    color: yellow;
    font-size: 22px;
}

.puzzleVariantTypeSelectBox {
    background-color: #8C8C8C;
    color: white;
    font-family: Consolas;
    font-size: 14px;
    height: 20px;
    width: 150px;
}

.commonText {
    color: white;
    font-family: Consolas;
    font-size: 15px;
}

.block-even {
    background-color: #333333;
    border: 1px solid #808080;
    height: 50px;
    padding: 5px;
    text-align: center;
    vertical-align: middle;
    width: 50px;
}

.block-odd {
    background-color: #545454;
    border: 1px solid #808080;
    height: 50px;
    padding: 5px;
    text-align: center;
    vertical-align: middle;
    width: 50px;
}

.block-even_Solution {
    background-color: #333333;
}

.block-odd_Solution {
    background-color: #545454;
}

.block-special_Solution {
    background-color: #000000;
}

.cssSolvedCell {
    color: lightgreen;
}

.cssExcludeCandidate {
    color: cyan;
}

.cssGuessAndProceedRule {
    color: red;
}

.cssNormalRule {
    color: lightgray;
}

.solutionStepsHeader {
    color: lightgray;
    font-size: 13px;
    padding-left: 10px;
}

.custom-upload-btn {
    background-color: #292929;
    border-radius: 3px;
    box-shadow: 2px 2px 0px #000;
    color: white;
    cursor: pointer;
    display: inline-block;
    font-weight: bold;
    font-size: 16px;
    height: 28px;
    padding: 5px 7px 0px 7px;
    text-align: center;
    vertical-align: middle;
    width: auto;
}

    .custom-upload-btn:hover {
        color: yellow;
    }