body {
  margin: auto;
}

img {
  vertical-align: top;
}

header,
footer,
section {
  position: relative;
  margin: auto;
  max-width: 1000px;
  width: 100vw;
}

.back {
  width: 100%;
}

.not_back {
  position: absolute;
}

/* LINE追加ボタン共通css */
.l_button {
  width: 90%;
  left: 5.5%;
}

.l_button:hover {
  opacity: 0.8;
  cursor: pointer;
}

.l_button:active {
  opacity: 1;
  transform: translate3d(0, 5px, 0);
  filter: brightness(0.9);
}

#l_button_2 {
  top: 61%;
  opacity: 2;
}

#l_button_4 {
  top: 65.5%;
  opacity: 2;
}