#main {
 text-align: center;
 padding-top: 30px;
}

.button {
  margin: 10px;
  border: 2px solid lightblue;
  border-radius: 15px;
  width: 150px;
  background-color: lightblue;
  padding-top: 40px;
  padding-bottom: 45px;
}

.row {
  margin: auto;
  width: 680px;
}

.screen {
  border: 2px solid gray;
  border-radius: 15px;
  height: 75px;
  width: 660px;
  margin: auto;
}