.quiz-modal{
display:none;
position:fixed;
top:0;
left:0;
width:100%;
height:100%;
background:rgba(0,0,0,.7);
justify-content:center;
align-items:center;
}

.quiz-box{
background:#fff;
padding:30px;
border-radius:10px;
width:400px;
margin:100px auto;
text-align:center;
}

.quiz-box label{
display:block;
margin:10px 0;
}

.quiz-timer{
font-weight:bold;
margin-bottom:20px;
}