#main {
  position: relative;
  background: #eee;
  height: 100vh;
  width: 100%;
  margin: 0 auto;
  overflow: auto;
}

#sub {
  background: #fff;
  width: 70%;
  transform: translate(-50%, -30%);
  position: absolute;
  top: 30%;
  left: 50%;
  padding: 40px;
  overflow: auto;
}
.btn-style5, .btn-style5:focus {
  margin-top: 56px;
  color: #FFF;
  background-color: #2b5490;
  border-color: #2b5490;
  letter-spacing: .5px;
  width: 80%;
  height: 64px;
  font-size: 2em;
}
.btn-style5:hover {
  background-color: #5bc0de;
  color: #FFF;
  letter-spacing: .5px;
  font-size: 2em;
}
.cent {
	margin-left: auto;
	margin-right: auto;
}

@media (max-width: 576px) {
  #main {
  	background-color: #fff;
  }
  #sub {
  	width: 100%;
  }
  h1 {
  	font-size: 24px;
  }
  .btn-style5, .btn-style5:hover {
  	margin-top: 24px;
  	font-size: 18px;
  	height: auto;
  	padding: 12px;
  }
}