.main-img {
  background-image: url(../img/top/main.jpeg) no-repeat center center;
  background-size: cover;
}

.card-img-top {
  width: 100%;
  min-width: 100%;
  height: auto;
}
.card-body {
  min-height: 150px;
}

.card-img-top {
  height: 100%\9; /* IE10以下 */
}

header {
  width: 100%;
  background: #007bff;
  padding: 10px 0 20px 0;
}
nav {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  position: relative;
}
#g-nav {
  /*position:fixed;にし、z-indexの数値を大きくして前面へ*/
  position: fixed;
  z-index: 999;
  /*ナビのスタート位置と形状*/
  top: -120%;
  left: 0;
  width: 100%;
  height: 100vh; /*ナビの高さ*/
  background: #007bff;
  /*動き*/
  transition: all 0.6s;
}

/*アクティブクラスがついたら位置を0に*/
#g-nav.panelactive {
  top: 0;
}

/*ナビゲーションの縦スクロール*/
#g-nav.panelactive #g-nav-list {
  /*ナビの数が増えた場合縦スクロール*/
  position: fixed;
  z-index: 999;
  width: 100%;
  height: 100vh; /*表示する高さ*/
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

/*ナビゲーション*/
#g-nav ul {
  /*ナビゲーション天地中央揃え*/
  position: absolute;
  z-index: 999;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  @media screen and (max-width: 480px) {
    left: 30%;
  }
}

/*リストのレイアウト設定*/

#g-nav li {
  list-style: none;
  /*text-align: center;*/
  text-align: left;
}

#g-nav li a {
  color: #fff;
  text-decoration: none;
  padding: 10px;
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: bold;
}

/*========= ボタンのためのCSS ===============*/
.openbtn {
  /*position:fixed;*/
  position: absolute;
  z-index: 9999; /*ボタンを最前面に*/
  top: 5px;
  right: 10px;
  cursor: pointer;
  width: 50px;
  height: 50px;
}

/*×に変化*/
.openbtn span {
  display: inline-block;
  transition: all 0.4s;
  position: absolute;
  left: 14px;
  height: 3px;
  border-radius: 2px;
  background-color: #fff;
  width: 45%;
}

.openbtn span:nth-of-type(1) {
  top: 15px;
}

.openbtn span:nth-of-type(2) {
  top: 23px;
}

.openbtn span:nth-of-type(3) {
  top: 31px;
}

.openbtn.active span:nth-of-type(1) {
  top: 18px;
  left: 18px;
  transform: translateY(6px) rotate(-45deg);
  width: 30%;
}

.openbtn.active span:nth-of-type(2) {
  opacity: 0;
}

.openbtn.active span:nth-of-type(3) {
  top: 30px;
  left: 18px;
  transform: translateY(-6px) rotate(45deg);
  width: 30%;
}

@media all and (-ms-high-contrast: none) {
  .card-img-top {
    height: 100%; /* IE10以上 */
  }
}