new.css

*{
    box-sizing :border-box;
    /* display: flex; */
}
body{
    /* background-color: white; */
    background: linear-gradient(to bottom, grey, black);
    background-repeat: no-repeat;
    /* background-position: center; */
background-attachment:fixed ;
    background-size: cover;
    font-family: 'poppins', 'sans-serif';
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    height: auto;
    /* overflow: hidden; */
    margin: 37px;
}
.quiz-container{
    background-color:  black;
    border: 5px solid red;
    color: white;
    border-radius: 10px;
    box-shadow: 0 0 20px 2px;
    width: 600px;
    /* height: 90vh; */
    overflow: hidden;

}
.quiz-header{
    padding: 40px;
    

}
h2{
    padding: 40px;
    text-align: center;
    margin: 0;
}
ul{
    list-style: none;
}
ul li{
    font-size: 20px;
    padding: 10px;
    /* border: 2px solid red;
    background-color: black; */
    border-radius: 5px;
    box-shadow: 0 0 10px 2px;
}
ul li label{
    cursor: pointer;

}
#btnSubmit{
    background-color: red;
    color: white;
    border: none;
    padding: 20px;
    border-radius: 5px;
    display: block ;
    width: 100%;
    font-size: 20px;
    font-family: inherit;
    
}
#btnSubmit:hover{
    background-color: orangered;
}
#btnSubmit:focus{
    outline: none;
    background-color: green;
}