style.css

*
{
    box-sizing: border-box;
}

body
{
    background-color: #b8c6db;
    background-image: linear-gradient(315deg, #b8c6db 0%, #f5f7fa 100%);
    font-family: 'Poppins', sans-serif;
    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 rgba(100,100,100,0.1);
    width:  600px;
    overflow: hidden;
}

.quiz-header
{
 padding: 4rem;
}

h2{
    padding: 1rem;
    text-align: center;
    margin: 0;
}

ul{
    list-style-type: none;
    padding: 0;
}

ul li{
    font-size: 1.3rem;
    margin:  1rem 0;
}

ul li label
{
    cursor: pointer;
}

button 
{
    background-color: #8e44ad;
    border: none;
    color: #fff;
    display: block;
    width: 100%;
    cursor: pointer;
    font-size: 1.1rem;
    font-family: inherit;
    padding: 1.3rem;
}

button:hover{
    background-color: #732d91;
}

button:focus
{
    outline: none;
    background-color: #5e3370;
}