*{
  padding: 0;
  margin: 0;
  text-align: center;
}

body {
  margin: 0 auto 200px auto;
  background-image: url("image/back.png");
  background-size: cover;
  background-position: left;
  background-attachment: fixed;
}

.main{
  width: auto;
}

.block{
  width: 800px;
  margin: 50px auto;
  padding: 50px;
  background-color: rgba(178, 252, 255, 0.7);
  border-radius: 30px;
}

img{
  margin: 20px auto;
  width: 700px;
  border: solid 5px gray;
  border-radius: 20px;
}

.button{
  width: 430px;
  height: 50px;
  border-radius: 10px;
  background-color: whitesmoke;
  cursor : pointer;
  font-size: 24px;
  font-weight: bold;
  letter-spacing: 2px;
  color: black;
}
.caution{
  margin: 0px auto 0px auto;
  width: 600px;
  color:red;
  font-weight: bold;
  vertical-align: middle;
}
.text_area{
  margin: 60px auto 0px auto;
  padding: 10px;
  width: 600px;
  border-radius: 30px;
  background-color: rgba(50,50,50,0.8);
  color:white;
  vertical-align: middle;
}
a:link{
  color:#ff00ff
}
a:visited{
  color:#ff00ff
}