main.css

body {
  overflow: visible;
}
ons-row {
  text-align: center;
  margin-top: auto;
  height: auto;
}
ons-input[type="text"] {
  margin: 3px auto;
}
.CalculateButton {
  margin: 10px auto;
  margin-top: 2px;
}
ons-col {
  width: 100%;
}
#outer-div {
  height: 100%;
}
.inner-div {
  margin: auto;
  width: 64%;
  height: 100%;
  background-color: white;
}
.UserInput {
  padding-bottom: 5px;
}
.text {
  text-align: center;
  width: 100%;
  margin: 12px;
}

#confirm {
  display: none;
  background-color: rgb(78, 126, 236);
  border: 1px solid #aaa;
  border-radius: 5px;
  position: fixed;
  width: 200px;
  left: 50%;
  margin-left: -100px;
  margin-top: 368px;
  padding: 6px 8px 8px;
  box-sizing: border-box;
  text-align: center;
}
#confirm button {
  background-color: #48e5da;
  display: inline-block;
  border-radius: 5px;
  border: 1px solid #aaa;
  padding: 5px;
  text-align: center;
  width: 80px;
  cursor: pointer;
}
#confirm .message {
  text-align: left;
}

#overlay {
  position: fixed; /* Sit on top of the page content */
  display: none; /* Hidden by default */
  width: 100%; /* Full width (cover the whole page) */
  height: 100%; /* Full height (cover the whole page) */
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5); /* Black background with opacity */
  z-index: 2; /* Specify a stack order in case you're using a different order for other elements */
  cursor: pointer; /* Add a pointer on hover */
}