style.css

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

body {
    background-color: #f9f7de;
    background-image: linear-gradient(to right bottom, #526c2d, #1f5c3e, #004845, #0f333c, #191f25);
    background-attachment: fixed;
    font-family: 'Quicksand', sans-serif;
    display: flex;
    text-align: center;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: white;
}

h1 {
    text-align: center;
    font-size: 2.5rem;
    margin: 1rem;
}

.game {
    display: flex;
    flex-wrap: wrap;
    margin: 0 auto;
    justify-content: space-between;
    padding: 1rem 0;
}

.circle {
    background-color: #191f25;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 1rem;
    pointer-events: none;
}

.circle.active {
    background-color: #325553;
    background-image: url('assets/flag.svg');
    background-size: cover;
}

button {
    font-family: inherit;
    color: inherit;
    font-size: 1.5rem;
    padding: 0.5rem 1.5rem;
    margin: 1rem;
    border: none;
    border-radius: 5px;
    background-color: #191f25;
    cursor: pointer;
    box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
}

.hidden {
    display: none;
}

/* overlay modal */

.overlay {
    background-color: rgba(51, 51, 51, 0.8);
    position:fixed;
    top:0;
    left:0;
    z-index: 1000;
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    visibility: hidden;
}

.modal {
    background-color: #004845;
    color:white;
    min-height: 30vh;
    min-width: 20vw;
    padding: 2rem;
    border-radius: 15px;
    position: relative;
}

.modal p {
    margin: 1rem 0 0;
    padding: 1rem 0;
    font-size: 1.5rem;
}

.modal button {
    position: absolute;
    top: 0;
    right: 0;
    margin: 0;
    box-shadow: none;
}

/* mobile support */
@media (max-width:600px) {
    .game {
        justify-content: center;
        align-items: center;
    }

    .modal {
        height: 40vh;
        width: 80vw;
    }
}