body {
    font-family: verdana, helvetica, arial, sans-serif;

}

/* board */
.sudoku_board {
    margin: 6px auto;

    overflow: hidden;

    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;

    border: 1px solid #2c3e50;
}

.sudoku_board .cell {
    width: 11.11%;
    display: inline-block;
    float: left;
    cursor: pointer;
    text-align: center;
    overflow: hidden;

    -webkit-box-sizing: border-box;
    /* Safari/Chrome, other WebKit */
    -moz-box-sizing: border-box;
    /* Firefox, other Gecko */
    box-sizing: border-box;

    box-shadow: 0px 0px 0px 1px #bdc3c7;

    background: white;
}

.sudoku_board .cell.border_h {
    box-shadow: 0px 0px 0px 1px #bdc3c7, inset 0px -2px 0 0 #34495e;
}

.sudoku_board .cell.border_v {
    box-shadow: 0px 0px 0px 1px #bdc3c7, inset -2px 0 0 #34495e;
}

.sudoku_board .cell.border_h.border_v {
    box-shadow: 0px 0px 0px 1px #bdc3c7, inset -2px 0 0 black, inset 0px -2px 0 black;
}

.sudoku_board .cell span {
    color: #2c3e50;
    font-size: 14px;
    text-align: middle;
}

.sudoku_board .cell.selected,
.sudoku_board .cell.selected.fix {
    background: #FFE;
}

.sudoku_board .cell.selected.current {
    position: relative;
    background: #3498db;
    font-weight: bold;
    box-shadow: 0px 0px 3px 3px #bdc3c7;
}

.sudoku_board .cell.selected.current span {
    color: white;
}

.sudoku_board .cell.selected.group {
    color: blue;
}

.sudoku_board .cell span.samevalue,
.sudoku_board .cell.fix span.samevalue {
    font-weight: bold;
    color: #3498db;
}

.sudoku_board .cell.notvalid,
.sudoku_board .cell.selected.notvalid {
    font-weight: bold;
    color: white;
    ;
    background: #e74c3c;
}

.sudoku_board .cell.fix {
    background: #ecf0f1;
    cursor: not-allowed;
}

.sudoku_board .cell.fix span {
    color: #7f8c8d;
}

.sudoku_board .cell .solution {
    font-size: 10px;
    color: #d35400;
}

.sudoku_board .cell .note {
    color: #bdc3c7;
    width: 50%;
    height: 50%;
    display: inline-block;
    float: left;
    text-align: center;
    font-size: 14px;

    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

.gameover_container .gameover {
    color: white;
    font-weight: bold;
    text-align: center;

    display: block;
    position: absolute;
    width: 90%;
    padding: 10px;

    box-shadow: 0px 0px 5px 5px #bdc3c7;
}


.restart {
    background: #7F8C8D;
    color: #ecf0f1;
}

/* console */
.board_console_container,
.gameover_container {
    background-color: rgba(127, 140, 141, 0.7);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;

    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.board_console {
    display: block;
    position: absolute;
    width: 50%;
    color: white;
    background-color: rgba(127, 140, 141, 0.7);
    box-shadow: 0px 0px 5px 5px #bdc3c7;
}

.board_console .num {
    width: 33.33%;
    color: #2c3e50;
    padding: 1px;
    display: inline-block;
    font-weight: bold;
    font-size: 24px;
    text-align: center;
    cursor: pointer;

    -webkit-box-sizing: border-box;
    /* Safari/Chrome, other WebKit */
    -moz-box-sizing: border-box;
    /* Firefox, other Gecko */
    box-sizing: border-box;

    box-shadow: 0px 0px 0px 1px #bdc3c7;
}


.board_console .num:hover {
    color: white;
    background: #f1c40f;
}

.board_console .num.remove {
    width: 66.66%;
}

.board_console .num.note {
    background: #95a5a6;
    color: #ecf0f1;
}

.board_console .num.note:hover {
    background: #95a5a6;
    color: #f1c40f;
}

.board_console .num.selected {
    background: #f1c40f;
    box-shadow: 0px 0px 3px 3px #bdc3c7;
}

.board_console .num.note.selected {
    background: #f1c40f;
    box-shadow: 0px 0px 3px 3px #bdc3c7;
}

.board_console .num.note.selected:hover {
    color: white;
}

.board_console .num.no:hover {
    color: white;
    cursor: not-allowed;
}

.board_console .num.remove:hover {
    color: white;
    background: #c0392b;
}

.statistics {
    text-align: center;
}

#sudoku_menu {
    background-color: black;
    position: absolute;
    z-index: 2;
    width: 100%;
    height: 100%;
    left: -100%;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
}

#sudoku_menu ul {
    margin: 0;
    padding: 100px 0px 0px 0px;
    list-style: none;
}

#sudoku_menu ul li {
    margin: 0px 50px;
}

#sudoku_menu ul li a {
    text-align: center;
    padding: 15px 20px;
    font-size: 28px;
    font-weight: bold;
    color: white;
    text-decoration: none;
    display: block;
    border-bottom: 1px solid #2c3e50;
}

#sudoku_menu.open-sidebar {
    left: 0px;
}

#sidebar-toggle {
    z-index: 3;
    background: #bdc3c7;
    border-radius: 3px;
    display: block;
    position: relative;
    padding: 22px 18px;
    float: left;
}

#sidebar-toggle .bar {
    display: block;
    width: 28px;
    margin-bottom: 4px;
    height: 4px;
    background-color: #f0f0f0;
    border-radius: 1px;
}

#sidebar-toggle .bar:last-child {
    margin-bottom: 0;
}

/*Responsive Stuff*/

@media all and (orientation:portrait) and (min-width: 640px) {
    h1 {
        font-size: 50px;
    }

    .statistics {
        font-size: 30px;
    }

    .sudoku_board .cell span {
        font-size: 60px;
    }

    .board_console .num {
        font-size: 60px;
    }
}

@media all and (orientation:landscape) and (min-height: 640px) {
    h1 {
        font-size: 50px;
    }

    .statistics {
        font-size: 30px;
    }

    .sudoku_board .cell span {
        font-size: 50px;
    }

    .board_console .num {
        font-size: 50px;
    }
}

@media all and (orientation:portrait) and (max-width: 1000px) {
    .sudoku_board .cell span {
        font-size: 30px;
    }
}

@media all and (orientation:portrait) and (max-width: 640px) {
    .sudoku_board .cell span {
        font-size: 24px;
    }

    .sudoku_board .cell .note {
        font-size: 10px;
    }
}

@media all and (orientation:portrait) and (max-width: 470px) {
    .sudoku_board .cell span {
        font-size: 16px;
    }

    .sudoku_board .cell .note {
        font-size: 8px;
    }
}

@media all and (orientation:portrait) and (max-width: 320px) {
    .sudoku_board .cell span {
        font-size: 12px;
    }

    .sudoku_board .cell .note {
        font-size: 8px;
    }
}

@media all and (orientation:portrait) and (max-width: 240px) {
    .sudoku_board .cell span {
        font-size: 10px;
    }
}