* {
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  height: 100%;
}

body {
  padding: 0;
  box-sizing: border-box;
  overflow: hidden;
  font-family: "Poppins","Noto Sans JP", "メイリオ", Meiryo, "ヒラギノ角ゴ Pro W3", "Hiragino Kaku Gothic Pro", sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
}

.top-box {
  max-width: 768px;
  text-align: center;
}

.top-box img {
    width: 75%;
  }
  
.space {
  margin: 80px 0 50px 0;
}

.top-box a.btn-gra {
  line-height: 1;
  padding: 15px 2em;
  border-radius: 50px;
  transition: 0.5s;
  color: #fff;
  box-shadow: 0px 5px 30px rgba(65, 84, 241, 0.4);
  box-shadow: 0px 5px 30px rgba(255, 255, 255, 0.4);
  background: #0071ac;
  background: -moz-linear-gradient(left, #0071ac 0%, #00b0c7 100%);
  background: -webkit-linear-gradient(left, #0071ac 0%, #00b0c7 100%);
  background: linear-gradient(to right, #0071ac 0%, #00b0c7 100%);
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#0071ac', endColorstr='#00b0c7',GradientType=1 );
  text-decoration: none;
}

.top-box a.btn-gra:hover {
  color: #fff;
  background: #00b0c7;
  background: -moz-linear-gradient(left, #00b0c7 0%, #0071ac 100%, #0071ac 100%);
  background: -webkit-linear-gradient(left, #00b0c7 0%, #0071ac 100%, #0071ac 100%);
  background: linear-gradient(to right, #00b0c7 0%, #0071ac 100%, #0071ac 100%);
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00b0c7', endColorstr='#0071ac',GradientType=1 );
  text-decoration: none;
}

.top-box a.btn-gra span {
  font-family: "Poppins","Noto Sans JP", sans-serif;
  font-weight: 500;
  font-size: 18px;
  letter-spacing: .06em;
}

.top-box a.btn-gra i {
  margin-left: 5px;
  font-size: 18px;
}



@media (max-width: 768px) {
.top-box img {
    width: 65%;
  }
  
.space {
  margin: 70px 0 40px 0;
}

.top-box a.btn-gra {
  padding: 12px 1.5em;
}
.top-box a.btn-gra span {
  font-size: 16px;
}

.top-box a.btn-gra i {
  margin-left: 5px;
  font-size: 16px;
}
}