.center-text{
  text-align: center;
}
div.data {
	width: 50%;
  height: auto;
  border: 1px solid black;
}

.container {
position: absolute;
top: 50%;
left: 50%;
transform: translateX(-50%) translateY(-50%);
}

body {
  background-color: #f2f2f2;
}
.center {
  margin: auto;
  width: 90%;
  border: 2px solid #0FAA4B;
  padding: 10px
}

.btn {
  background-color: #0FAA4B; /* Green */
  border: none;
  color: white;
  padding: 5px 10px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  margin: 4px 2px;
  cursor: pointer;
}

.btn1 {font-size: 10px;}
.btn2 {font-size: 12px;}
.btn3 {font-size: 16px;}
.btn4 {font-size: 20px;}
.btn5 {font-size: 24px;}