main {
    text-align: center;
}

#input_alert {
    color: red;
}

#submit, #scan {
    background-color: #696969;
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}

input[type=text] {
    width: 10%;
    padding: 10px 5px;
    margin: 8px 0;
    box-sizing: border-box;
}

table {
    border-collapse: separate;
    margin: auto;
    text-align: center;
}

th, td {
    padding: 8px;
}

a {
    color: cornflowerblue;
    text-decoration: none;
}

a:hover {
    color: pink;
    text-decoration: none;
}

a:visited {
    color: cornflowerblue;
    text-decoration: none;
}

a:active {
    color: pink;
    text-decoration: none;
}

#QSL {
    max-width: 100%;
    overflow-x: auto;
}

#overlay {
    display: none;
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2;
    cursor: pointer;
}

.card_notice {
    background-color: black;
    color: white;
    padding: 1%;
    z-index: 1;
}

.card {
    perspective: 150rem;
    position: relative;
    height: 40rem;
    max-width: 840px;
    margin: 0 auto;
    margin-top: 3%;
    box-shadow: none;
    background: none;
    z-index: -1;
}

.card-side {
    height: 100%;
    transition: all 0.8s ease;
    backface-visibility: hidden;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 2rem;
    color: white;
}

.card-side.back {
    transform: rotateY(-180deg);
    background-image: linear-gradient(43deg, #4158D0 0%, #C850C0 46%, #FFCC70 100%);
}

.card-side.front {
    background-image: linear-gradient(160deg, #0093E9 0%, #80D0C7 100%);
}

.card:hover .card-side.front {
    transform: rotateY(180deg);
}

.card:active .card-side.front {
    transform: rotateY(180deg);
}

.card:hover .card-side.back {
    transform: rotateY(0deg);
}

.card:active .card-side.back {
    transform: rotateY(0deg);
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: black;
        color: white;
    }
    .card_notice {
        background-color: white;
        color: black;
    }
}