body {
    margin: 0;
    font-family: "メイリオ", Meiryo, Osaka, "ＭＳ Ｐゴシック", "MS PGothic", sans-serif;	/*フォント種類*/
    font-size: 11pt;
    --accent: linear-gradient(135deg, #6a5cff, #00d4ff);
    --back-color:#c3f9df;
      background: #fff;	/*背景色*/
    color: black;	    /*全体の文字色*/
    /*text-align: center;*/
}

img{
  max-width: 50%;
}
h1{
  margin: 0;
}
.a{
  width: 1200px;
  margin: 0 auto;
}
.a .logo{
  width: 100px;
/*  margin-top: 36px;*/
  margin-left: 4%;  
 
}
.header{
  max-width: 1200px;
  margin: 0 auto;
  padding: 0;
  background-color: #6fb5ff;
  text-align: center;
  position: sticky;
  top:0;
  z-index: 10;
}
.h-nav{
  margin-top: 0;
  padding: 0;
 }
.main{
  float: left;
  width: 50%;
  padding: 10px;
  background-color: #b3d874;
  text-align: center;
/*  height:400px;*/
}
.side{
  width: 50%;
  margin: 0 auto;
  padding: 10px;
  background-color: #ff838b;
  text-align: center;
}
.kaisetsu{
  display: block;
  text-align: left;
  margin: 0 auto;
/*  padding: 10px;*/
}
.b{
  letter-spacing: -.4em;
  font-size: 18px;
  margin-top: 0;
  margin-bottom: 0;
  list-style: none;
  padding: 0;
}
.b li{
  letter-spacing: normal;
  display: inline-block;
  width: calc(100%/6);
}
.b li a{
  display: block;
  text-decoration: none;
  position: relative;
  text-align: center;
  padding: 10px 0px;
  text-transform: none;
  color: #1a1a1a;
  text-decoration: none;
}
.c{
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
}
.h-img{
  max-height: 400px;
  min-width: 1200px;
}
h3 {
  background-color: #bcf0bf; /*青色*/
}
.wrapper {
        display: grid;
        grid-gap: 5px;
        grid-template-columns: 1fr; 
        grid-template-rows: 400px 150px; 
}
.box1{
      grid-column-start: 1;
      grid-row-start: 1;
}
.box2{
      grid-column-start: 1;
      grid-row-start: 2;
}
.box3{
      grid-column-start: 1;
      grid-row-start: 3;
}
/*