/* リセット・基本設定 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  line-height: 1.8;
  color: #212529;
  background-color: #fff;
}

/* コンテナ */
#main {
  max-width: 900px;
  margin: 0 auto;
  box-shadow: 0 .5rem 1rem rgba(0,0,0,.15) !important;
}
.container {
  padding: 5px 50px 50px;
}

.main-heading ,.sub-heading {
  text-align: center;
  font-weight: bold;
  margin-bottom: 20px;
  line-height: 1.3;
}
.main-heading {
  font-size: 50px;
}

.sub-heading {
  font-size: 30px;
}

.sub-heading strong {
  font-weight: 600;
}

.mail-info p {
  margin-bottom: 20px;
  font-size: 18px;
  line-height: 1.6;
}

.mail-info p:last-child {
  margin-bottom: 0;
}

.mail-info strong {
  font-weight: 600;
  color: #000;
}

.mail-info .fnt-m {
  font-weight: 600;
  color: #ff0000;
  font-size: 25px;
}


/* レスポンシブ対応 */
@media (max-width: 767px) {
  .container {
  padding: 5px 15px 15px;
}
  .main-section {
    padding: 15px 0;
  }
  .main-heading {
    font-size: 28px;
  }
  .sub-heading {
    font-size: 21px;
  }
  .mail-info p {
    font-size: 16px;
  }
}