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

}

body {
    font-family: 'Poppins', sans-serif;
    background: #210e4e;
    color: #333;
    line-height: 1.6;
    font-size: 16px;
    padding-bottom: 100px;

}

.app {
    background: #fff;
    width: 90%;
    max-width: 600px;
    margin: 100px auto 0;
    border-radius: 10px;
    padding: 30px;

}

.app h1 {
    font-size: 25px;
    color: #001e4d;
    font-weight: 600;
    border-bottom: 1px solid #333;
    padding-bottom: 30px;
}

.quiz {
    padding: 20px 0;
}

.quiz h2 {
    font-size: 18px;
    color: #001e4d;
}

.btn {
    background: #fff;
    color: #222;
    font-weight: 500;
    width: 100%;
    border: 1px solid #222;
    padding: 10px;
    margin: 10px 0;
    text-align: left;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn:hover:not([disabled]) {
    background: #222;
    color: #fff;
}

.btn:disabled {
    cursor: no-drop;
}

#next-btn {
    background: #001e4d;
    color: #fff;
    font-weight: 500;
    width: 150px;
    border: 0;
    padding: 10px;
    margin: 20px auto 0;
    border-radius: 4px;
    cursor: pointer;
    display: none;
}

.correct {
    background: #9aeabc;
}

.incorrect {
    background: #ff9393;
}

@media screen and (max-width: 768px) {
    body {
        width: 100%;
        height: 85vh;

    }

    .app {
        width: 95%;
        display: flex;
        align-items: center;
        flex-direction: column;
        justify-content: center;
        height: 110%;
        padding-bottom: 10px;
    }

    footer a {
        display: none;
    }

}