body {
    text-align: center;
    background-color: #011F3F;
    margin: 0;
    padding: 0;
}

#level-title {
    font-family: 'Press Start 2P', cursive;
    font-size: 3rem;
    margin: 5%;
    color: #FEF2BF;
}

.container {
    display: block;
    width: 80%;
    margin: auto;
}

.row {
    display: flex;
    justify-content: center;
    margin: 20px 0;
}

a {
    color: #e7d40e;
    text-decoration: none;
}

footer {
    color: #DBEDF3;
    font-family: "Arvo", cursive;
    margin-top: 20px;
}

.btn {
    margin: 10px;
    display: inline-block;
    height: 150px;
    width: 150px;
    border: 10px solid black;
    border-radius: 20%;
    font-family: 'Press Start 2P', cursive;
    font-size: 2rem;
    color: white;
    line-height: 150px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
    transform: scale(1.1);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.game-over {
    background-color: red;
    opacity: 0.8;
}

.red {
    background-color: red;
}

.green {
    background-color: green;
}

.blue {
    background-color: blue;
}

.yellow {
    background-color: yellow;
}

.pressed {
    box-shadow: 0 0 20px white;
    background-color: grey;
}


@media (max-width: 768px) {
    .btn {
        height: 120px;
        width: 120px;
        font-size: 1.5rem;
        line-height: 120px;
    }

    #level-title {
        font-size: 2rem;
    }

    .container {
        width: 90%;
    }
}

@media (max-width: 480px) {
    .btn {
        height: 100px;
        width: 100px;
        font-size: 1.2rem;
        line-height: 100px;
    }

    #level-title {
        font-size: 1.5rem;
    }

    .container {
        width: 100%;
    }
}