capitals.css

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

body{
    background: #001e4d;
}

.app{
    background: #fff;
    width: 90%;
    max-width: 600px;
    margin: 100px auto 0;
    border-radius: 10px;
    padding: 30px;
}

.app h1{
    font-size: 25px;
    color: #001e4d;
    font-weight: 600;
    border-bottom: 1px solid #333;
    padding-bottom: 30px;
}

#quiz{
    padding: 33px 0;
    display: none;
}

#quiz h2{
    font-size: 18px;
    color: #001e4d;
    font-weight: 600;
}

.btn{
    background: #fff;
    color: #222;
    font-weight: 500;
    width: 100%;
    border: 1px solid #222;
    padding: 10px;
    margin: 10px 0;
    text-align: left;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn:hover:not([disabled]){
    background: #222;
    color: #fff;
}

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

#next-btn{
    background: #001e4d;
    color: #fff;
    font-weight: 500;
    width: 150px;
    border: 0;
    padding: 10px;
    margin: 20px auto 0;
    border-radius: 4px;
    cursor: pointer;
    display: none;
}

.correct{
    background: #9aeabc;
}

.incorrect{
    background: #ff9393;
}

#select{
    margin-top: 20px;
}

#select h4{
    color: #001e4d;
    font-size: 20px;
}

.but{
    margin-top: 15px;
}

.but button{
    background: #1d54ac;
    color: #fff;
    font-weight: 500;
    border: 0;
    width: 130px;
    padding: 10px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.4s ease;
}

.but button:hover{
    background: #001e4d;
    color: #fff;
}

.but a{
    color: white;
    text-decoration: none;
}