@import url('https://fonts.googleapis.com/css?family=Montserrat:300,600&display=swap');
* {
    box-sizing: border-box;
}

body {
    font-family: 'Montserrat', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    overflow: hidden;
    background-color: lightgreen;
    background-image: linear-gradient(315deg, lightgreen 0%, white 100%);
}

.quiz-container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 10px 10px 5px 0px rgba(0, 0, 0, 0.75);
    width: 600px;
    overflow: hidden;
}

.quiz-header {
    padding: 4rem;
}

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

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

ul li {
    font-size: 1.2rem;
    margin: 1rem 0;
    cursor: pointer;
}

button {
    background-color: seagreen;
    color: white;
    border: none;
    display: block;
    width: 100%;
    cursor: pointer;
    font-size: 1.1rem;
    font-family: inherit;
    padding: 1.34rem;
}

button:hover {
    background-color: green;
}

button:focus {
    outline: none;
    background-color: green;
}