.button {
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
  }

body {
    position: relative;
    top: 50px;
    height: 4000px;
    padding-top: 5px;
    font-family: sans-serif;
  }

header {
    background-color: blueviolet;
    font-size: 2em;
    padding: 10px;
    width: 100%;
    height: 40px;
    position: fixed;
    top: 0%;
}
.calculating {
  font-weight: bold;
  font-size: 2em;
  height: 2.1em;
  margin: 0 auto;
  background-color: lavender;  
  width: 200px;
  text-align: center;
  padding: 10px;
}
#startingB {
  background-color: aliceblue;
}