html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

img {
  width: 100%;
}

header {
  background: url(../images/bg1.png) no-repeat center top/contain;
  width: 100%;
  height: auto;
  position: relative;
}

.sec00 {
  position: relative;
  top: -7vw;
}

header {
  width: 100%;
}

.sp03 {
  width: 90%;
  margin: 0 auto;
}

.btn {
  display: block;
  height: auto;
  position: relative;
}
.btn img {
  width: 90%;
  position: relative;
  left: 9vw;
  top: -4vw;
}

.sec01 {
  background: url(../images/bg3.png) no-repeat center center/contain;
  width: 100%;
  height: auto;
  position: relative;
  top: -2vw;
}