body {
    color: #fff;
    font-family: arial,sans-serif;
    background-image: url("../images/bg_1080.png");
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    background-color: #512c1e;
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
}

.game-container {
    margin: 0 auto;
    text-align: center;
    vertical-align: top;
}

.game-container .points {
    position: relative;
    height: 10vh;
    width: 100vw;
    background-color: rgba(255, 255, 255, 0.8);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: 1fr;
    column-gap: 0;
    row-gap: 0;
}

.game-container .points .value-text {
    color: #000;
    font-size: 9vh;
    justify-self: flex-start;
    align-self: flex-start;
    width: 40vw;
    height: 10vh;
    line-height: 10vh;
    vertical-align: middle;
    margin: 0;
    padding: 0;
    display: inline-block;
}

.game-container .points .btn-reload {
    display: inline-block;
    width: 10vw;
    height: 10vh;
    margin: 0;
    padding: 0;
    cursor: pointer;
}

.game-container .points .btn-reload img {
    height: 100%;
}

.game-container .box {
    position: relative;
    height: 90vh;
    width: 100vw;
}

.hide {
    display: none;
}

.box {
    margin: 0 auto;
    text-align: center;
    vertical-align: top;
    position: relative;
}

.level-wrapper {
    position: absolute;
    display: block;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
}

.level-wrapper .center {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.level-wrapper .logo {
    width: 100%;
    margin: 0 auto;
}
.level-wrapper .logo img {
    width: 100%;
}

.btn {
    cursor: pointer;
    display: inline-block;
    font-weight: 400;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    border: 1px solid transparent;
    padding: .375rem .75rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: .25rem;
    transition: color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out;
}

.btn:focus {
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgb(0 123 255 / 25%);
}

.btn.btn-level {
    display: block;
    margin: 1% auto;
    color: #fff;
    background-color: #6c757d;
    border-color: #6c757d;
    width: 20%;
    min-width: 200px;
    font-size: 1.5em;
}

.btn-level.easy {
    background-color: #28a745;
    border-color: #28a745;
}
.btn-level.easy:focus {
    box-shadow: 0 0 0 0.2rem rgb(40 167 69 / 50%);
}

.btn-level.normal {
    background-color: #007bff;
    border-color: #007bff;
}
.btn-level.normal:focus {
    box-shadow: 0 0 0 0.2rem rgb(0 123 255 / 50%);
}

.btn-level.hard {
    background-color: #dc3545;
    border-color: #dc3545;
}
.btn-level.hard:focus {
    box-shadow: 0 0 0 0.2rem rgb(220 53 69 / 50%);
}

.btn-level.extreme {
    background-color: #6610f2;
    border-color: #6610f2;
}
.btn-level.extreme:focus {
    box-shadow: 0 0 0 0.2rem rgb(102 16 242 / 50%);
}

.btn-level.insane {
    background-color: #fd7e14;
    border-color: #fd7e14;
}
.btn-level.insane:focus {
    box-shadow: 0 0 0 0.2rem rgb(253 126 20 / 50%);
}

.points {
    position: relative;
    height: 10vh;
    background-color: rgba(255, 255, 255, 0.8);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: 1fr;
    column-gap: 0;
    row-gap: 0;
}

.card-box {
    height: 85vh;
	list-style: none;
	padding: 2vh 0;
	margin: 0 auto;
	display: grid;
    max-width: 1024px;
	grid-template-columns: repeat(4, 1fr);
	grid-template-rows: repeat(4, 1fr);
	column-gap: 2vw;
	row-gap: 2vh;
}

.card-box .card {
	justify-self: center;
	align-self: center;
    width: 100%;
    height: 100%;
    cursor: pointer;
    -webkit-transition: 0.6s; /* Safari */
    transition: 0.6s;
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d; /* Chrome, Safari, Opera */
    position: relative;
}

.card-box .card img {
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 100%;
	border: 2px solid transparent;
}

.card-box .card.open {
    transform: rotateY(180deg);
    -ms-transform: rotateY(180deg); /* IE 9 */
    -webkit-transform: rotateY(180deg); /* Chrome, Safari, Opera */
}

.front, .back {
    -webkit-backface-visibility: hidden; /* Chrome, Safari, Opera */
    backface-visibility: hidden;
    position: absolute;
    top: 0;
	bottom: 0;
    left: 0;
	right: 0;
}

.front {
    z-index: 2;
    transform: rotateY(0deg);
    -ms-transform: rotateY(0deg); /* IE 9 */
    -webkit-transform: rotateY(0deg); /* Chrome, Safari, Opera */
}

.back {
    transform: rotateY(180deg);
    -ms-transform: rotateY(180deg); /* IE 9 */
    -webkit-transform: rotateY(180deg); /* Chrome, Safari, Opera */
}

.front img.selected {
	border: 2px solid #fff;
}