.c-btn {
    -webkit-appearance: none;
    appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50%;
    height: 50px;
    padding: 0;
    border: solid 1px;
    outline: none;
    font-size: 20px;
    text-decoration: none;
    background: silver;
    cursor: pointer;
}
.p-quiz {
    width: 600px;
    margin: 50px auto;
    text-align: center;
}
.p-ttl {
    margin: 0 0 20px;
}
.p-quiz-ttl {
    margin: 0 0 20px;
    font-weight: normal;
}
.p-quiz-next {
    width: 300px;
    margin: auto;
}
.p-quiz-choices {
    flex-wrap: wrap;
    width: 100%;
    margin: 0;
    padding-left: 0;
}
.p-quiz-choices__item {
    list-style: none;
    margin: 5px;
}
#result {
    margin: 1em 0em;
    font-size: large;
    font-weight: bold;
}
.quiz-correct {
    color: red;
    font-size: 30px;
    font-weight: 500;
}
.quiz-incorrect {
    color: blue;
    font-size: 30px;
    font-weight: 500;
}
.p-quiz-commentary {
    font-size: 20px;
}
.none {
    display: none;
}