@charset "UTF-8";
body {
  font-family: 'Noto Sans JP', sans-serif;
  background-color: #DAEAEE;
  font-size: 62.5%；

 }

  @media (max-width:640px){
    font-size : 80%;
  }

header {
  background-color: #2B6567;
  width: 100%;
  height: 150px;
  margin-bottom: 40px; 
}
@media (max-width:640px){
  header{
    height: 180px;
  }
}
  header h1 {
    color: yellow;
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    padding-top: 30px; }
  header h2 {
    color: white;
    font-size: 1.6rem;
    font-weight: 600;
    text-align: center; }

main {
  width: 900px;
  margin: 40px auto;
  padding: 40px;
  font-size: 1.4rem;
  line-height: 2.2rem;
  background-color: #fff;
  color: #333; 
}
@media (max-width:640px){
  body{
    width: 100%;
  }
  main{
    width: 100%;
    padding:40px 20px;
  }
}
  main h3 {
    position: relative;
    padding: 1rem 2rem calc(1rem + 10px);
    background: #fff100;
    font-weight: 600; }
  main h3:before {
    position: absolute;
    top: -7px;
    left: -7px;
    width: 100%;
    height: 100%;
    content: '';
    border: 4px solid #000; }
  main .img_container {
    display: flex;
    align-items: center; }
  main .yu {
    width: 100px;
    height: 100px; }
  main .gyakusou-link {
    width: 100%; }
  main .img_general {
    width: 100%; }
  main .fontcolor-red {
    color: red;
    font-weight: 600; }
  main .underline {
    border-bottom: 4px double #333; }
  main .yellow-underline {
    background: linear-gradient(transparent 50%, yellow 50%);
    font-weight: 600; }
  main .red-underline {
    background: linear-gradient(transparent 50%, pink 50%);
    font-weight: 600; }
  main .text-align-center {
    text-align: center; }
  main .bold {
    font-weight: 600; }

@media (min-width: 960px) {
  .btn {
    margin: 0 auto;
    display: block;
    width: 400px; }

  .btn:hover {
    opacity: 0.7;
    filter: alpha(opacity=70);
    -ms-filter: "alpha(opacity=70)"; } 
  }
@media (max-width: 960px) {
  .btn {
    margin: 0 auto;
    display: block;
    width: 200px; }

  .btn:hover {
    opacity: 0.7;
    filter: alpha(opacity=70);
    -ms-filter: "alpha(opacity=70)"; } 
  }

  .cus .audio-box p.title br{
    display: none;
  }
  @media (max-width:640px){
    .cus .audio-box p.title {
        font-size:32px !important;
    }
    .cus .audio-box p.title br{
      display: block;
    }
    .cus .audio-box p{
        font-size: 28px !important;
    }
  }