*{
    margin :0;
    padding: 0;
    font-family: 'poppins',sans-serif;
    box-sizing: border-box;
}

body{
    background: #001e4d;
}

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

.app h1{
    font-size: 25px;
    color: brown;
    font-weight: bold;
    border-bottom: 1px solid green;
    padding-bottom: 15px;
}

.quiz
{
    padding: 20px 0;
}

.quiz h2{
    font-size: 20px;
    color: blueviolet;
    font-weight: bold;
}

.btn
{
    background: whitesmoke;
    color:navy;
    font-weight: bold;
    width: 100%;
    border: 1px solid grey;
    padding: 10px;
    margin: 10px 0px;
    text-align: left;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
}

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

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

#next-btn
{
    background: lightcoral;
    color: black;
    font-weight: bold;
    width: 150px;
    border: 1px solid blueviolet;
    padding: 10px;
    margin: 20px auto 0;
    border-radius: 5px;
    cursor: pointer;
    display: none;
}

.correct
{
    background: green;
    
}

.incorrect
{
    background: red;
    opacity: 0.7;
}