body {
  font-size: 16px;
  width: 100%;
  margin: 0px;
  padding: 0px;
  font-family: sans-serif;
  word-wrap: break-word;
}
html,
body {
  width: 100%;
  height: 100%;
  background-color: #f7f7f7;
}
button.btn {
  width: 200px;
}
@media only screen and (max-width: 640px) {
  .main {
    width: 100% !important;
    display: block !important;
    border-width: 0 0 1px 0 !important;
    border-radius: 0 !important;
    margin: 0 !important;
  }
  div[class=responsive] {
    display: block !important;
    width: 100% !important;
    box-sizing: border-box !important;
    font-size: 18px !important;
  }
  img.flexible {
    width: 100% !important;
    max-width: 100% !important;
    height: auto !important;
  }
  button.btn {
    width: 100% !important;
    max-width: 100% !important;
    padding: 11px 19px !important;
    font-size: 17.5px !important;
  }
  .content {
    width: 100% !important;
  }
}
.wrapMain {
  width: 100%;
}
.main {
  border: #b6b6b6 1px solid;
  border-radius: 10px;
  background-color: #fff;
  display: block;
  margin: 100px auto;
  width: 640px;
}
.responsive {
  padding: 20px;
}
.title {
  text-align: center;
}
.content {
  margin: 0 auto;
  width: 430px;
  line-height: 1.5;
  text-align: center;
}
.btn-wrapper {
  text-align: center;
}