body {
    background-image: url('background.jpg');
    color: white;
    margin: 0px;
    padding: 0px;
    font-family: 'Montserrat', sans-serif;
}

#navbar {
    display: flex;
    justify-content: space-between;
    padding: 20px 20px 20px 0px;
    background-color: rgba(0, 0, 0, 0.2);
}

#navbar div {
    color: white;
    font-size: 30px;
    font-weight: 600;
    margin: 0px 20px;
}

.transparent-background {
    background-color: transparent;
}

.container {
    border-radius: 7px;
    background-color: rgba(0, 0, 0, 0.5);
    padding: 30px 40px;
    width: 50%;
    margin: auto;
    margin-top: 60px;
    text-align: center;
}

.button {
    padding: 15px 25px;
    border: white solid 1px;
    border-radius: 7px;
    color: white;
    font-weight: bold;
    font-size: 20px;
}

.card {
    padding: 20px 0px 20px 0px;
}

.title {
    margin: 0px 0px 20px 0px;
    font-weight: 600 !important;
    font-size: 80px;
}

.sub-title a {
    color: white;
    font-size: 30px;
}

.hidden {
    display: none !important;
}

.control-panel {
    margin-top: 100px;
}

.control-panel h3 {
    margin: 0px;
    padding: 0px;
}

#play-btn {
    font-size: 35px;
    font-weight: 600;
}

#player_name_input_container input {
    font-size: 30px;
    border-radius: 7px;
    border: white solid 1px;
    text-align: center;
    padding: 10px 0px;
    color: white;
    background-color: rgba(0, 0, 0, 0);
    width: 308px;
}

#player_name_input_container input::placeholder {
    color: white;
    font-weight: 300;
}

#player_name_input_container {
    margin: 0px 0px 100px 0px;
}

/* GAME DESIGN */

 /* flip */
 .card__container {
    width: 150px;
    height: 120px;
    position: relative;
    perspective: 800px;
}
.card {
    width: 100%;
    height: 100%;
    position: absolute;
    transition: transform 0.5s;
    transform-style: preserve-3d;
}
.card div {
    height: 100%;
    width: 100%;
    color: white;
    text-align: center;
    line-height: 160px;
    font-size: 50px;
    position: absolute;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    background: rgba(0, 0, 0, 0.5);
}

.card .back {
    transform: rotateY( -180deg );
    background: rgba(0, 0, 0, 0.8);
}
.card.flipped {
    transform: rotateY( -180deg );
}
/* flip end */

.selected {
    background-color: whitesmoke;
    color: black;
}

#dificulty-selector {
    padding: 10px 0px 15px 0px;
    margin: 10px 0px 0px 0px;
}

#dificulty-selector button {
    font-weight: 200;
}

#dificulty-selector button:focus {
    outline: none;
}

#game-area {
    padding: 70px 200px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    grid-gap: 76px;
}

#timer {
    margin-right: 20px;
    display: block;

    margin-left: -5%;
    position: absolute;
    font-size: 50px;
}

#player-name-display {
    display: inline-block;
    font-size: 35px;
}

#restart-btn {
    padding: 10px;
    font-size: 15px;
}