style.scss

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

.flex-col {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.flex-row {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}

.set__row {
    border-bottom: 2.5px solid black !important;
}

.set__col {
    border-right: 2.5px solid black !important;
}

.given {
    font-weight: 800;
    background-color: whitesmoke;
    color: black;
}

.emptyItem {
    font-weight: 600;
    color: blue;
    background-color: #d1d8e0;
    cursor: pointer;
}

.emptyItem.selected {
    background-color: #45aaf2;
    color: whitesmoke;
}

html {
    width: 100%;
    height: 100%;
    user-select: none;

    body {
        height: 100%;
        width: 100%;
        background-image: url("images/bg.jpg");
        background-repeat: no-repeat;
        background-size: cover;
        background-size: 100% 100%;

        #main__container {
            display: none;
            width: 60vh;
            height: 80vh;
            position: relative;

            #header__controls {
                height: 10vh;
                width: 100%;
                justify-content: space-around;

                #header__menu {
                    width: 33.3%;
                    font-family: "Poppins";
                    text-align-last: left;

                    img {
                        cursor: pointer;
                        height: 0.754rem;
                        vertical-align: middle;
                        margin-left: 0.25rem;
                    }

                    img:active {
                        padding: 1px;
                    }
                }

                #header__header {
                    width: 33.3%;
                    font-size: 2rem;
                    text-align: center;
                    font-family: "Recursive";
                }

                #header__submit {
                    width: 33.3%;
                    text-align: right;
                    font-family: "Poppins";

                    span {
                        border: 1px solid black;
                        padding: 5px 8px;
                    }

                    span:hover {
                        background-color: #27ae60;
                        border-color: #27ae60;
                        color: white;
                        font-weight: 400;
                        cursor: pointer;
                    }

                    span:active {
                        padding: 4px 7px;
                    }
                }

            }

            #dotMenu {
                display: none;
                min-width: 30%;
                height: 20%;
                position: absolute;
                left: 0;
                top: 8vh;

                &>div {
                    background-color: #f1f2f6;
                    border: 1px solid rgba(164, 176, 190, 1.0);
                    font-family: 'Poppins';
                    font-size: 1.075rem;
                    margin-bottom: 1px;
                    text-align: center;
                    padding: 0.2rem 0;
                    cursor: pointer;

                    &:not(:last-child):hover {
                        background-color: #a4b0be;
                        color: white;
                    }

                    &:active {
                        transform: scale(0.98);
                    }
                }

                #solver {
                    position: relative;
                    padding: 0;

                    span {
                        display: block;
                        width: 100%;
                        height: 100%;
                        padding: 0.2rem 0;

                        &:after {
                            content: "Solver ▷";
                        }

                        &:hover,
                        &:focus {
                            background-color: #a4b0be;
                            color: white;

                            &:after {
                                content: "Solver ▶";
                                color: black;
                            }
                        }
                    }

                    #solverMenu {
                        display: none;
                        position: absolute;
                        left: 102%;
                        top: -1%;
                        min-width: 100%;

                        div {
                            background-color: #f1f2f6;
                            border: 1px solid rgba(164, 176, 190, 1.0);
                            font-family: 'Poppins';
                            font-size: 1.075rem;
                            margin-bottom: 1px;
                            text-align: center;
                            padding: 0.2rem 0;
                            cursor: pointer;

                            &:hover {
                                background-color: #a4b0be;
                                color: white;
                            }

                            // check box Start
                            input[type=checkbox]+label {
                                display: block;
                                margin: 0.1rem;
                                cursor: pointer;
                                padding: 0.1rem;
                            }

                            input[type=checkbox] {
                                display: none;
                            }

                            input[type=checkbox]+label:before {
                                content: "\2714";
                                border: 0.1em solid #000;
                                border-radius: 0.2rem;
                                display: inline-block;
                                width: 0.7rem;
                                height: 0.7em;
                                padding-left: 0.3rem;
                                padding-bottom: 0.6rem;
                                padding-right: 0.2rem;
                                margin-right: 0.5rem;
                                vertical-align: bottom;
                                color: transparent;
                                transition: .2s;
                            }

                            input[type=checkbox]+label:active:before {
                                transform: scale(0);
                            }

                            input[type=checkbox]:checked+label:before {
                                background-color: MediumSeaGreen;
                                border-color: MediumSeaGreen;
                                color: #fff;
                            }

                            input[type=checkbox]:disabled+label:before {
                                transform: scale(1);
                                border-color: #aaa;
                            }

                            input[type=checkbox]:checked:disabled+label:before {
                                transform: scale(1);
                                background-color: #bfb;
                                border-color: #bfb;
                            }

                            // check box End
                        }

                    }
                }
            }

            #board {
                width: 60vh;
                height: 60vh;
                font-family: "Ubuntu";
                border-top: 2.5px solid black;
                border-left: 2.5px solid black;
                display: grid;
                grid-template-columns: auto auto auto auto auto auto auto auto auto;
                grid-template-rows: auto auto auto auto auto auto auto auto auto;

                .grid__item {
                    border-right: 1px solid rgba(0, 0, 0, 0.7);
                    border-bottom: 1px solid rgba(0, 0, 0, 0.7);
                }
            }

            #keypad {
                width: 100%;
                height: 6vh;
                margin-top: 2vh;
                font-family: "Red Rose";

                .keypad__item {
                    height: 80%;
                    width: 8%;
                    margin-right: 1%;
                    margin-left: 1%;
                    border: 1px solid black;
                    border-radius: 50%;
                    text-align: center;
                    background-color: white;
                    cursor: pointer;

                    &:hover {
                        border: 1px solid black;
                        background-color: wheat;
                        font-weight: 600;
                    }

                    &:active {
                        transform: scale(0.96);
                        outline: none;
                    }



                }
            }


        }

        #home {
            display: block;
            position: relative;
            width: 60vh;
            height: 60vh;
            border-radius: 0.25rem;

            #header {
                height: 30%;
                font-size: 4rem;
                margin-top: 1rem;
                text-align: center;
                font-family: 'Recursive';
            }

            .selection {
                font-size: 1rem;
                width: 80%;
                height: 30%;
                margin: 2rem auto 1rem auto;
                vertical-align: middle;

                .title {
                    width: 30%;
                    font-size: 1.075rem;
                    font-weight: 600;
                }

                .options {
                    width: 70%;
                }
            }

            #selection__size .options {
                justify-content: space-around;

                svg:hover {
                    cursor: pointer;
                    color: #047cbd;
                }

                //defaul selection
                span:first-child {
                    color: #0097e6;
                }
            }

            #selection__level .options span {
                border: 1px solid black;
                padding: 0.3rem 0.5rem;
                margin-right: 0.2rem;
                cursor: pointer;

                &:hover {
                    background-color: #0097e6;
                    color: white;
                }

                &:active {
                    background-color: #0097e6;
                    color: white;
                }

                //default selection
                &:last-child {
                    color: white;
                    background-color: #0097e6;
                }
            }

            #start {
                font-family: 'Raleway';
                width: 40%;
                font-size: 2.25rem;
                position: absolute;
                bottom: 10%;
                left: 0;
                right: 0;
                margin: 0 auto;
                cursor: pointer;
                border: 1px solid darkcyan;
                background-color: #44bd32;

                &:hover {
                    background-color: #3fac2f;
                }

                &:active {
                    transform: scale(0.96);
                }
            }
        }
    }
}


//media queries
@media only screen and (max-width: 600px) {
    html {

        body {
            height: 100vh;
            background-size: 100vw 100vh;

            #main__container {
                width: 100vw;

                #header__controls {
                    width: 100vw;
                    padding: 0 2vw;
                }

                #board {
                    margin-left: auto;
                    margin-right: auto;
                    width: 96vw;
                    height: 100vw;
                }

                #keypad {
                    margin-left: auto;
                    margin-right: auto;
                    width: 96vw;

                    .keypad__item {
                        height: 8vw;
                        width: 8vw;
                    }
                }
            }

            #home {
                width: 90vw;

                .selection {

                    .options {
                        width: 100%;
                    }
                }

                #header #start {
                    margin-bottom: 1.5rem;
                }
            }
        }
    }
}


// other helper classes
.d-block {
    display: block !important;
}

.green {
    color: purple;
}

//currently not using this
.solverHover {
    background-color: #a4b0be;
    color: white;
}