img {
    width: 50px;
    height: 50px;
    border-radius: 50px;
    position: absolute;
    bottom: 568px;
    left: 891px;
    background-color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
}
body {
    font-family: verdana,helvetica,arial,sans-serif;
    border: 0px;
    margin: 0px;
    padding: 0px;
    background-color: #ccff99;
}

/* board */
.sudoku_board {
    margin: 6px auto;
    overflow: hidden;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    box-shadow: 0px 0px 5px 5px #bdc3c7;
    margin-top: 61px;
}

    .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: #ff33cc;
                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: yellow;
            cursor: not-allowed;
        }

            .sudoku_board .cell.fix span {
                color: black;
            }

        .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 {
    background: url(../image/popup.png);
    position: absolute;
    z-index: 2;
    width: 25%;
    margin-left: 474px;
    height: 41%;
    left: -100%;
    box-sizing: border-box;
    margin-top: -9px;
    font-weight: bold;
    text-align: center;
    font-size: 31px;
}

.rst {
    margin-left: 65px;
}

.reset {
    font-size: 26px;
    margin-top: -35px;
    margin-left: 20px;
    color: black;
    font-weight: bold;
    font-family: monospace;
}

.restart {
    font-family: monospace;
    background: blueviolet;
    margin-top: 96px;
    text-align: center;
    padding: 15px 20px;
    font-size: 28px;
    font-weight: bold;
    color: black;
    text-decoration: none;
    display: block;
    border-bottom: 7px solid red;
    cursor: pointer;
    border-radius: 48px;
}

/* 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: #ff6600;
        }

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

        .board_console .num.note {
            background: white;
            color: black;
        }

            .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;
    margin-top: -580px;
    font-size: 30px;
    font-family: monospace;
}

#sudoku_menu {
    background:url(../image/popup.png);
    position: absolute;
    z-index: 2;
    width: 25%;
    margin-left: 532px;
    height: 62%;
    left: -100%;
    box-sizing: border-box;
    margin-top: 62px;
}

    #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: url(../image/restart.png);
    background-size:50px 50px;
    border-radius: 3px;
    display: block;
    position: relative;
    padding: 22px 24px;
    float: left;
    cursor:pointer;
}

    #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;
    }
}

@media screen and (max-width: 1000px) {
    #sudoku_menu {
        width: 251px;
        height: 360px;
        margin-top: 40px;
        margin-left: 55px;
        left: -350%;
    }

    .restart {
        margin-top: 50px;
    }

    .statistics {
        margin-top: -440px;
        padding: 37px;
    }

    #sudoku_container {
        margin-top: 120px;
    }

    .gameover_container .gameover {
        margin-left: 12px;
        width: 301px;
        height: 272px;
        margin-top: 9px;
    }
    .rst {
        margin-top: 89px;
        margin-left: 49px;
    }

    img {
        left: 293px;
        top: 110px;
    }
}