body{

background:#111827;

font-family:Arial;

display:flex;

justify-content:center;

align-items:center;

height:100vh;

margin:0;

color:white;

}

.card{

background:#1f2937;

padding:40px;

border-radius:15px;

width:450px;

text-align:center;

box-shadow:0 0 30px rgba(0,0,0,.4);

}

#question{

font-size:48px;

margin:30px;

}

input{

width:150px;

font-size:30px;

padding:10px;

text-align:center;

}

button{

margin-top:20px;

padding:15px;

font-size:20px;

cursor:pointer;

}