.left_navi {
  display: flex;
  flex-direction: column;
}
.gas_btn {
  position: fixed;
  top: 21%;
  left: 0;
  width: 45px;
  height: 73px;
  border-top-right-radius:5px;
  border-bottom-right-radius:5px;
  background: #218e9d;
  color: #fff;
  font-size: .9rem;
  line-height: 1.2em;
  opacity: 0.8;
  
  display: flex;
  
  -webkit-writing-mode: vertical-rl;
  -ms-writing-mode: tb-rl;
  -o-writing-mode: vertical-rl;
  writing-mode: vertical-rl;
  
  align-items: center;
  padding: 28px 0;
  z-index: 2000;
}
.machinary_btn {
  position: fixed;
  top: 37%;
  left: 0;
  width: 45px;
  height: 73px;
  border-top-right-radius:5px;
  border-bottom-right-radius:5px;
  background: #ca5b95;
  color: #fff;
  font-size: .9rem;
  line-height: 1.2em;
  opacity: 0.8;
  
  display: flex;
  
  -webkit-writing-mode: vertical-rl;
  -ms-writing-mode: tb-rl;
  -o-writing-mode: vertical-rl;
  writing-mode: vertical-rl;
  
  align-items: center;
  padding: 28px 0;
  z-index: 2000;
}
.materials_btn {
  position: fixed;
  top: 53%;
  left: 0;
  width: 45px;
  height: 59px;
  border-top-right-radius:5px;
  border-bottom-right-radius:5px;
  background: #2a6daf;
  color: #fff;
  font-size: .9rem;
  line-height: 1.2em;
  opacity: 0.8;
  
  display: flex;
  
  -webkit-writing-mode: vertical-rl;
  -ms-writing-mode: tb-rl;
  -o-writing-mode: vertical-rl;
  writing-mode: vertical-rl;
  
  align-items: center;
  padding: 35px 0;
  z-index: 2000;
}
.foods_btn {
  position: fixed;
  top: 69%;
  left: 0;
  width: 45px;
  height: 49px;
  border-top-right-radius:5px;
  border-bottom-right-radius:5px;
  background: #d75f40;
  color: #fff;
  font-size: .9rem;
  line-height: 1.2em;
  opacity: 0.8;
  
  display: flex;
  
  -webkit-writing-mode: vertical-rl;
  -ms-writing-mode: tb-rl;
  -o-writing-mode: vertical-rl;
  writing-mode: vertical-rl;
  
  align-items: center;
  padding: 40px 0;
  z-index: 2000;
}


.contents {
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
}
.top_midasi {
  width: 99%;
  position: relative;
  display: inline-block;
  font-size: 1.0rem;
  font-weight: bold;
  margin: 10px 0;
  padding: 0 0 0 1%;
  text-align: left;
  font-family: '微软雅黑','宋体';
  border-bottom: 4px solid #77b5bf;
  z-index: -999;
}
.top_midasi::before {
  position: absolute;
  left: 0;
  bottom: -4px;
  content:"";
  width: 8%;
  height: inherit;
  border-bottom: 4px solid #107480;
}
.top_midasi::after {
  position: absolute;
  left: 8%;
  bottom: -4px;
  content:"";
  width: 8%;
  height: inherit;
  border-bottom: 4px solid #218e9d;
}

.top_txt {
  width: 98%;
  margin: 0 auto 20px auto;
  padding: 1%;
  font-size: 1rem;
  line-height: 1.6em;
  font-family: '微软雅黑','宋体';
  text-align: justify;
  color: #218e9d;
}
.business_contents {
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
}
.business_link {
  display: flex;
  justify-content: space-around;
  width: 60%;
  margin: 0 auto 60px;
}
.business_link a {
  text-decoration: none;
}
.gas_type {
  background: #218e9d;
  border-radius: 5px;
  padding: 7px 16px;
  color: #fff;
  font-size: .9rem;
  letter-spacing: .1em;
  font-weight: bold;
}
.business_gaiyo {
  display: block;
  width: 100%;
  height: 100%;
}
.gas_box {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  font-family: '微软雅黑','宋体';
}
.gas_box p {
  text-align: center;
}
.airgas_img {
  max-width: 716px;
  width: 100%;
}
.airgas_img2 {
  max-width: 761px;
  width: 100%;
}
.page_tit {
  border-bottom: 1px solid #000;
  font-size: 1rem;
  line-height: 1.4em;
  font-weight: bold;
  color: #218e9d;
  padding: 2px 0 0 8px;
  margin: 50px auto 20px;
}

.airgas_flex {
  width: 100%;
  height: auto;
  margin: 30px auto 80px;
  padding: 0;
  font-size: 1rem;
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
  font-family: '微软雅黑','宋体';
}
.airgas_box p {
  text-align: center;
}

.airgas_box {
  width: 50%;
  height: auto;
  display: flex;
  flex-wrap: wrap;
}
.flex_box2 {
  width: 94%;
  margin-bottom: 2%;
  padding: 3% 3% 0;
  background: #dee8eb;
  text-align: justify;
}
.flex_box2:last-child {
  margin-bottom: 0;
}
.onsite_box {
  display: flex;
  flex-wrap: wrap;
  width: 46%;
  height: auto;
  padding: 1.5% 1.5% 0;;
  margin-left: 1%;
  background: #dee8eb;
}
.flex_box3 {
  width: 100%;
  background: #dee8eb;
  text-align: justify;
  margin: 0;
  padding: 0;
}

.airgas_tit {
  display: block;
  color: #181878;
  font-weight: bold;
  margin: 0;
  padding: 0;
}
.airgas_tit2 {
  color: #000;
  font-weight: bold;
  margin-top: 10px;
  padding: 0;
}

.helium_img {
  max-width: 676px;
  width: 100%;
}
.helium_img2 {
  max-width: 987px;
  width: 100%;
}
.helium_img3 {
  max-width: 644px;
  width: 100%;
}
.helium_img4 {
  max-width: 898px;
  width: 100%;
}
.helium_flex {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  font-size: 1rem;
  font-weight: bold;
}
.hydrogen_box {
  background: #faf8cb;
  border: 2px solid #218e9d;
  padding: 12px 10px;
  font-size: .9rem;
  line-height: 2em;
  font-weight: bold;
}
.hydrogen_box span { color: #218e9d; }
.hydrogen_supply {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin-bottom: 80px;
}
.hydrogen_flexbox {
  width: 49%;
  font-size: 1rem;
  line-height: 1.4em;
}
.bombe, .trailer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.bombe div:first-child, .trailer div:first-child { max-width: 255px; margin-bottom: 20px; padding-left: 5px; }
.bombe img, .trailer img { max-width: 227px; width: 100%; }

.hoshu_service {
  position: relative;
  background: #faf8cb;
  margin-bottom: 80px;
  padding: 55px 20px 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.hoshu_ttl { position: absolute; top: -10px; left: 0; }
.hoshu_midasi { position: absolute; top: 10px; right: 150px; max-width: 545px; width: 100%; }
.hoshu_left { max-width: 314px; width: 100%; }
.safty_box { border-left: 4px solid #218e9d; padding-left: 10px; font-size: 1rem; line-height: 1.4em; margin-bottom: 20px; }
.safty_box p { text-align: left; font-weight: bold; padding: 5px 0; margin: 0; }
.hoshu_right { max-width: 614px; width: 100%; }

.right_box {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.safty_box2 { width: 370px; display: flex; flex-direction: column; }

.electronic_img {
  max-width: 804px;
  width: 100%;
  margin-bottom: 70px;
}
.top_txt2 {
  max-width: 790px;
  width: 98%;
  margin: 0 auto 20px;
  padding: 1% 1% 1% 0;
  font-size: 1rem;
  line-height: 1.6em;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, "sans-serif";
  text-align: left;
  color: #218e9d;
}
.welding {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.welding_img { width: 180px; margin-bottom: 30px; }
.welding_box {
  max-width: 730px;
  width: 100%;
  margin-bottom: 60px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.welding_box div { margin-bottom: 40px; }

@media screen and (max-width: 998px){
.left_navi { display: none; }
.top_midasi {
  max-width: 998px;
  width: 98%;
  position: relative;
  display: inline-block;
  font-size: 1.0rem;
  font-weight: bold;
  margin: 10px 0;
  padding: 0 1%;
  text-align: left;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, "sans-serif";
  border-bottom: 4px solid #77b5bf;
  z-index: -999;
}
.top_midasi::before {
  position: absolute;
  left: 0;
  bottom: -4px;
  content:"";
  width: 8%;
  height: inherit;
  border-bottom: 4px solid #107480;
}
.top_midasi::after {
  position: absolute;
  left: 8%;
  bottom: -4px;
  content:"";
  width: 8%;
  height: inherit;
  border-bottom: 4px solid #218e9d;
}
.top_txt {
  max-width: 998px;
  width: 98%;
  margin: 0 auto 80px auto;
  font-size: .9rem;
  line-height: 1.6em;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, "sans-serif";
}
.top_txt2 {
  max-width: 68%;
  width: 98%;
  margin-bottom: 20px;
  padding: 1%;
  font-size: .9rem;
  line-height: 1.6em;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, "sans-serif";
  text-align: left;
  color: #218e9d;
}
.business_contents {
  max-width: 998px;
  width: 100%;
  margin: 0 auto;
}
.business_link {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  width: 80%;
  margin: 0 auto 60px;
}
.gas_type {
  background: #218e9d;
  border-radius: 5px;
  padding: 7px 16px;
  margin: 5px;
  color: #fff;
  font-size: .9rem;
  letter-spacing: .1em;
  font-weight: bold;
}
.business_gaiyo {
  display: block;
  width: 100%;
  height: 100%;
}
.gas_box {
  display: block;
  width: 96%;
  height: 100%;
  margin: 0 auto;
}
.page_tit {
  border-bottom: 1px solid #000;
  font-size: 1rem;
  line-height: 1.4em;
  font-weight: bold;
  padding: 2px 0 0 8px;
  margin-bottom: 20px;
}
.airgas_flex {
  width: 100%;
  height: auto;
  margin: 30px auto 80px;
  padding: 0;
  font-size: .9rem;
  display: flex;
  flex-flow: column;
  justify-content: space-between;
}
.airgas_box {
  width: 100%;
  height: auto;
  display: flex;
  flex-wrap: wrap;
}
.onsite_box {
  display: flex;
  flex-wrap: wrap;
  width: 94%;
  height: auto;
  padding: 3% 3%;
  margin: 2% 0 0 0;
  background: #dee8eb;
}
.bombe, .trailer {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.bombe div:first-child, .trailer div:first-child { max-width: 100%; margin-bottom: 20px; }
.bombe img, .trailer img { max-width: 227px; width: 100%; text-align: center; }
.hoshu_midasi { position: absolute; top: 40px; left: 15px; width: 90%; }
.hoshu_left { max-width: 314px; width: 100%; margin-top: 40px; }
}



@media screen and (max-width: 768px){

.leftnavi { display: none; }
.company_gaiyo {
  display: block;
  padding: 0px;
  height: 100%;
}
.top_txt {
  max-width: 768px;
  width: 98%;
  margin: 0 auto 80px auto;
  font-size: .9rem;
  line-height: 1.6em;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, "sans-serif";
}
.page_tit {
  border-bottom: 1px solid #000;
  font-size: 1rem;
  line-height: 1.4em;
  font-weight: bold;
  padding: 2px 0 0 8px;
  margin-bottom: 20px;
}
.info_box, .history_box {
  width: 85%;
  height: auto;
  overflow: hidden;
  border: 1px solid #b6b6b6;
  border-radius: 5px;
  margin: 0 auto 80px;
  padding: 0px 4% 10px;
  font-size: .9rem;
  display: block;
}
.welding, .welding_box { width: 100%; }
.welding_box div { width: 96%; margin: 0 auto 40px; }
.top_txt2 {
  max-width: 768px;
  width: 98%;
  margin-bottom: 20px;
  padding: 1%;
  font-size: .9rem;
  line-height: 1.6em;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, "sans-serif";
  text-align: left;
  color: #218e9d;
}
.welding_img { width: 212px; margin-bottom: 30px; text-align: center; }

}