/*CSS variables section*/

a {
    text-decoration: none;
}

.topnav {
    overflow: hidden;
    background-color: #333;
}

.topnav a {
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 15px;
}

.topnav a:hover {
    background-color: #292929;
    color: lime;
}

.topnav a.active {
    background-color: #330099;
    color: white;
}

.topnav a.active2 {
    background-color: #FF0000;
    color: white;
}

.topnav .icon {
    display: none;
}

body {
    font-family: Arial, sans-serif;
    margin-top: 0px;
    background-color: rgba(0, 0, 21, 1);
}

.card-container {
    display: flex;
    justify-content: center;
    margin-top: 50px;
    gap: 50px;
}

.bingo-card {
    background-color: #d3d3d3;
    border: 2px solid #333;
    padding: 10px;
    text-align: center;
    border-radius: 5px;
    width: 400px;
}

.bingo-header {
    font-weight: bold;
    color: #333;
    background-color: #2ecc71;
    padding: 5px;
}

.bingo-table {
    width: 100%;
    border-collapse: collapse;
}

.bingo-table td {
    width: 20%;
    height: 60px;
    border: 1px solid #333;
    font-size: 20px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.marked {
    background-color: #f9e79f;
}

.controls {
    margin-top: 10px;
}

.controls button {
    padding: 5px;
    margin-top: 5px;
    margin: 15px;
    cursor: pointer;
    border: 2px solid blue;
    border-radius: 5px;
}

/*General CSS and CSS reset*/

html {
  scroll-behavior: smooth;
}

/*MEDIA QUERIES*/

@media screen and (max-width: 600px) {
    .topnav a:not(:first-child) {display: none;}
    .topnav a.icon {
        float: right;
        display: block;
    }
}

@media screen and (max-width: 600px) {
    .topnav.responsive {position: relative;}
    .topnav.responsive .icon {
        position: absolute;
        right: 0;
        top: 0;
    }
    .topnav.responsive a {
        float: none;
        display: block;
        text-align: left;
   }
}