#chugen {
     max-width: 750px;
     margin: auto;
     font-size: 26px;
     font-family: "游ゴシック体", YuGothic, "游ゴシック Medium", "Yu Gothic Medium", "游ゴシック", "Yu Gothic", sans-serif;
     color: #000;
     padding-bottom: 1px;
     position: relative;
     line-height: 2;
 }
 @media (max-width: 750px) {
     #chugen {
         font-size: 3.55vw;
     }
 }
 #chugen img {
     width: 100%;
 }
 .youtube {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
}
.youtube iframe {
    position: absolute;
    top: 0;
    right: 0;
    width: 100% !important;
    height: 100% !important;
}

 #btn-f-top {
     position: fixed;
     z-index: 1000;
     right: 1em;
     bottom: 1em;
     width: 60px;
 }
 .nav {
     overflow: hidden;
 }
 .nav li {
     float: left;
     width: 50%;
 }
 .lnav {
     overflow: hidden;
 }
 .lnav li {
     float: left;
     width: 33.827%;
 }
 .lnav li:nth-child(2) {
     width: 32.344%;
 }
.section {
    margin: 0 4.66% 3em;
    border: 3px solid #4DA854;
    background: #4DA854;
}
.section .inner {
    background: #FFF;
    padding-bottom: 2em;
}
.btn-toggle {
    cursor: pointer;
}
.box-toggle {
    display: none;
}