header nav a.concept {
  opacity: 0.5; }

section {
  width: 100%;
  max-width: 600px;
  margin: 107px auto 126px; }
  @media only screen and (max-width: 880px) {
    section {
      margin: 28px 20px 43px;
      width: auto; } }
  section h1 {
    text-align: center;
    font-size: 15px;
    letter-spacing: 0.074em;
    margin-bottom: 70px; }
    @media only screen and (max-width: 880px) {
      section h1 {
        font-size: 12px;
        margin-bottom: 32px; } }
  section p {
    font-size: 15px;
    letter-spacing: 0.05em;
    line-height: 40px;
    text-align: justify; }
    @media only screen and (max-width: 880px) {
      section p {
        font-size: 12px;
        line-height: 27px; } }
footer {
  margin-top: 80px; }
  @media only screen and (max-width: 880px) {
    footer {
      margin-top: 62px; } }