*{
    box-sizing: border-box;
}
body{
    background-color: aquamarine;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    margin: 0; 
}
.quiz-container{
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 0 10px 2px rgba(100,100,100,0.1);
    width: 550px;
    overflow: hidden;
}
.quiz-header{
    padding: 50px;
}
h2{
    padding: 15px;
    text-align: center;
    margin: 0;
}
ul{
    list-style-type: none;
    padding: 0;
}
ul li{
    font-size: 18px;
    margin: 15px 0;
}
ul li label{
    cursor: pointer;
}
button{
    background-color: blue;
    color: #fff;
    border: none;
    display: block;
    margin: 5px auto 15px;
    width: 100px;
    cursor: pointer;
    font-size: 18px;
    padding: 10px;
}
button:hover{
    background-color: #732d91;
}
button:focus{
    outline: none;
    background-color: #5e3370;
}