body{
    background:#001e4d;
}
.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;
    font-weight:600;
    margin-top:1px;
}
.btn{
    background:#fff;
    color:#222;
    font-weight:500;
    width:100%;
    border:1px solid #222;
    padding:10px;
    margin:10px 0;
    text-align:left;
    border-radius:5px;
    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 4px;
    cursor:pointer;
    display:none;
    
}
.correct{
    background:#9aeabc;
}
.incorrect{
    background:#ff9393;

}