style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;
}

body {
    background: #164a8a;
    display: flex;
    justify-content: center;
    align-items: center;
}

.quiz {
    background: #F1E5D1;
    color: #03346E;
    width: 90%;
    max-width: 600px;
    margin: 75px auto 0;
    border-radius: 10px;
    border: 1px solid #03346E;
    padding: 30px;
    box-shadow: 10px 10px 4px #F1E5D1;
}

.quiz h1 {
    font-size: 25px;
    border-bottom: 2px solid #03346E;
    padding-bottom: 30px;
}

#questions h2{
    padding: 15px 0;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
}

.btn {
    background: #F1E5D1;
    color: #03346E;
    font-weight: 500;
    width: 100%;
    border: 1px solid #03346E;
    padding: 13px;
    margin: 10px 0;
    cursor: pointer;
    font-size: 1em;
    text-align: left;
    border-radius: 4px;
}

.btn:hover.btn:hover:not([disabled]) {
    background: #03346E;
    color: #F1E5D1;
}

.btn:disabled {
    cursor: no-drop;
}

#move-nxt {
    background: #03346E;
    color: #F1E5D1;
    font-weight: 500;
    width: 150px;
    border: none;
    padding: 10px;
    border-radius: 4px;
    margin: 20px auto 0;
    display: none;
    cursor: pointer;
}

.correct {
    background: #68e8a0;
}

.incorrect {
    background: #f76e6e;
}