body {
    font-family: "Hiragino Kaku Gothic ProN", "Segoe UI", sans-serif;
    background-color: #f2f2f2;
    color: #333;
    line-height: 1.7;
    margin: 0;
    padding: 0;
}
main {
    max-width: 100%;
    background: #fff;
    padding: 2em;
}
h1 {
    color: #333;
    font-size: 28px;
    text-align: center;
    margin-bottom: 50px;
}

h2 {
    font-size: 1.3em;
    margin-top: 2em;
}

h3{
  font-size: 20px;
}
.main-contens {
    max-width: 100%;
}

/* PC */
@media (min-width: 768px) {
  .main-contens {
      background: #fff;
      padding: 2em;
  }
  h1{
    font-size: 28.8px;
  }
}
/* スマホ */
@media (max-width: 767px) {
  .main-contens {
      max-width: 100%;
      padding-top: 20px;
  }
  
  h1{
    font-size: 28px;
  }
}