.pc {
  display: block;
}

@media screen and (max-width: 800px) {
  .pc {
    display: none;
  }
}

.sp {
  display: none;
}

@media screen and (max-width: 800px) {
  .sp {
    display: block;
  }
}

.text-indent {
  text-indent: -1em;
  padding-left: 1em;
}

#contents {
  max-width: 1024px;
}

.about {
  max-width: 800px;
  margin: 50px auto 50px;
}

.about_title {
  font-size: 24px;
  font-weight: 600;
  text-align: left;
  margin: 0 0 20px 0;
}

@media screen and (max-width: 800px) {
  .about_title {
    font-size: 20px;
    text-align: center;
  }
}

.about_text {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-direction: row-reverse;
  font-size: 18px;
}

@media screen and (max-width: 800px) {
  .about_text {
    flex-direction: column;
    font-size: 16px;
  }
}

.about_text img{
  max-width: 200px;
}

.about_text p {
  text-align: left;
  margin: 0 3em 0 0;
}

@media screen and (max-width: 800px) {
  .about_text p {
    margin: 2em 0 0 0;
  }
}

.present{
  max-width: 800px;
  margin: 50px auto 50px;
}

.present img{
  margin: 0 0 1em 0;
  max-width: 400px;
}

.present .spred{
  max-width: 700px;
}

@media screen and (max-width: 800px) {
  .present img{
    max-width: 300px;
  }
  
}

.present p{
  font-size: 18px;
  text-align: left;
}

@media screen and (max-width: 800px) {
  .present p {
    font-size: 16px;
  }
}

.howto {
  max-width: 800px;
  margin: 0 auto 50px;
  text-align: left;
}

.howto h3 {
  margin: 0 0 0.5em 0;
  font-size: 16px;
  font-weight: 600;
  text-align: left;
}

.howto .howto_btn {
  width: 220px;
  margin: 0 0 20px 1em;
}

.howto .howto_btn a {
  display: block;
  font-weight: 600;
  line-height: 2.5;
  text-align: center;
  color: #fff;
  background: #ef3838;
  text-decoration: none;
  opacity: 1;
  transition: opacity 0.2s ease-in-out;
}

.howto .howto_btn a:hover {
  opacity: 0.6;
}

.howto .howto_persent .howto_btn a{
  background: #0066ff;
}

.howto_mail {
  margin: 0 0 20px 0;
  padding: 0 1em;
}

.howto_mail .mail_list {
  margin: 0 0 0.5em 0;
}

.howto_mail .mail_list,
.howto_mail .contact_list {
  padding: 0 0 0 1em;
}

.howto_hand {
  margin: 0 0 20px 0;
  padding: 0 1em;
}

.howto_note {
  padding: 0 1em;
}

.archive {
  max-width: 800px;
  margin: 0 auto 50px;
  text-align: left;
}

.archive_title {
  font-size: 18px;
  font-weight: 600;
  text-align: left;
  margin: 0 0 0.5em 0;
}

@media screen and (max-width: 800px) {
  .archive_title {
    font-size: 16px;
  }
}

.archive #archive_list {
  padding: 0 1em;
}

.archive #archive_list li {
  margin: 0 0 0.5em 0;
  text-decoration: underline;
}

.archive #archive_list li a {
  transition: color 0.2s ease-in-out;
}

.archive #archive_list li a:hover {
  color: #ff0000;
}

.caution-box{
  margin: 0 0 1em 0;
  padding: 0.8em;
  border: solid 1px #000;
  display: inline-block;
}

.mb_1{
  margin-bottom: 1em;
}