* {
    box-sizing: border-box;
}

body {
    font-family: Tahoma, Arial;
}

.quiz-app {
    margin: 20px auto;
    width: 800px;
    background-color: #f8f8f8;
    padding: 15px;
}
.quiz-app .quiz-info {
    display: flex;
    background-color: #fff;
    padding: 20px;
}
.quiz-app .quiz-info .category {
    flex: 1;
}
.quiz-app .quiz-info .count {
    flex: 1;
    text-align: right;
}
.quiz-app .quiz-area {
    background-color: #fff;
    padding: 20px;
    margin-top: 15px;
}
.quiz-app .quiz-area h2 {
    margin: 0;
}
.quiz-app .answers-area {
    background-color: #fff;
    padding: 20px;
    margin-top: 10px;
}
.quiz-app .answers-area .answer {
    background-color: #f9f9f9;
    padding: 15px;
    cursor: pointer;
}
.quiz-app .answers-area .answer:not(:last-child) {
    border-bottom: 1px solid #dfdfdf;
}
.quiz-app .answers-area .answer input[type="radio"]:checked + label {
    color: #0075ff;
}
.quiz-app .answers-area .answer label {
    cursor: pointer;
    font-weight: bold;
    color: #777;
    font-size: 14px;
    margin-left: 5px;
    position: relative;
    top: -1px;
}
.quiz-app .submit-button {
    background-color: #0075ff;
    display: block;
    width: 100%;
    padding: 15px 15px;
    border: none;
    color: #fff;
    font-weight: bold;
    font-size: 18px;
    cursor: pointer;
    border-radius: 6px;
    margin:20px auto;
}
.quiz-app .submit-button:focus {
    outline: none;
}
.quiz-app .bullets {
    border-top: 1px solid #dfdfdf;
    background-color: #fff;
    display: flex;
    padding: 20px;
}
.quiz-app .bullets .spans {
    flex: 1;
    display: flex;
}
.quiz-app .bullets .spans span{
    width: 20px;
    height: 20px;
    background-color: #ddd;
    margin-right: 5px;
    border-radius: 50%;
}
.quiz-app .bullets .spans span.on{
    background-color: #0075ff;
}
.quiz-app .results{
    margin-top: 30px;
    font-size: 18px;
    background-color: white;
    padding: 20px;
}
.quiz-app .results span {
    font-weight: bold;
}
.quiz-app .results span.bad {
    color: #dc0a0a;
}
.quiz-app .results span.good {
    color: #009688;
}
.quiz-app .results span.perfect {
    color: #0075ff;
}

/* medium */
@media (max-width: 992px) {
    .quiz-app {
        width: 600px;
    }
}

/* small */
@media (max-width: 668px) {
    .quiz-app {
        width: 350px;
    }
}