.input-expression {
  font-size: 3rem;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
}

.input-prefix {
  display: inline-block;
}

.input-value {
  display: inline-block;
}

.value-error {
  color: red;
}

.value-ok {
  color: #32d132;
}

.button-start {
  display: none;
  max-width: 200px;
  border: 1px solid black;
  border-radius: 30px;
  font-size: 2rem;
  line-height: 2;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: #838383 0px 5px 10px;
  transition: box-shadow 0.3s;
}

.button-start:hover {
  box-shadow: #838383 0px 5px 5px;
}

.button-note {
  display: none;
  font-size: 2rem;
}