*{
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    box-sizing: border-box;

}
body{
    background:#033695 ;
}
.app{
    background: #fff;
    width: 90%;
    max-width: 600px;
    margin: 100px auto 0 ;
    border-radius: 15px;
    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;
}
.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: #033695;
    color: #fff;
}
.btn:disabled{
    cursor: no-drop;
}
#next-btn{
    background: #033695;
    color: #fff;
    font-weight: 500;
    width: 150px;
    border: 0;
    padding: 10px;
    margin: 20px auto 0;
    border-radius: 4px;
    cursor: pointer;
    display: none;

}
.correct{
    background: #5ce899;
}
.incorrect{
    background: #ff9393;
}