html,
body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  padding-top: 0px;
  padding-bottom: 0px;
  background-color: #f5f5f5;
}

.form-calculator {
  width: 100%;
  max-width: 450px;
  padding: 15px;
  margin: auto;
}

.row {
  padding-top: 4px !important;
  padding-bottom: 4px !important;
}

.input-group-addon {
  padding: 6px 12px;
  font-size: 14px;
  font-weight: 400;
  color: #555;
  text-align: center;
  background-color: #eee;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.toast-bg {
  background-color: rgba(255,255,255,.85);
}