.quiz-header{
  padding: 2rem;
}
button.quiz_sub {
    background-color: #7d8ca3;
    color: #fff;
    border: none;
    display: block;
    width: 150px;
    margin: 0 auto;
    cursor: pointer;
    font-size: 1.1rem;
    font-family: inherit;
    padding: 13px 20px;
    border-radius: 10px 0;
}
button.quiz_sub:hover{
  background-color: #79a9d1;
  border-radius: 0;
}
button.quiz_sub:focus{
  outline: none;
  background-color: #79a9d1;
}
#question{
  margin-bottom: 20px;
}