* {
  font-family: "Trebuchet MS", sans-serif;
  margin: 0;
}

button {
  background: #bbbbbb;
  border: 1px solid white;
  border-radius: 0.2rem;
  padding: 0.2rem;
}

button:hover {
  background: #cccccc;
}

body {
  margin: 0;
  background-color: #aaaaaa;
}

.container {
  display: flex;
  width: 90%;
  margin-left: auto;
  margin-right: auto;
  flex-direction: column;
  gap: 1rem;

  padding: 2rem;
}

.tape {
  border-radius: 0.25rem;
  box-shadow: 5px 5px 5px #666666;

  display: flex;

  padding: 1rem;

  align-items: center;
  gap: 1rem;

  height: 5rem;
  max-width: 100%;

  border: 2px solid white;

  overflow-x: scroll;
  overflow-y: hidden;
}

.cell {
  border-radius: 0.25rem;
  box-shadow: 2px 2px 5px #666666;
  background-color: #dddddd;

  position: relative;
  height: 80%;
  transition: border 0.1s ease-in-out;
  transition: background 0.1s ease-in-out;

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  flex: 1;
  gap: 0.2rem;

  padding: 0.2rem;
}

.circle {
  position: absolute;
  bottom: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 10px;
  height: 10px;
  background-color: wheat;
  border-radius: 50%;
  opacity: 0.001;
  transition: opacity 0.1s ease-in-out;
}

.cell.reading .circle {
  opacity: 1;
}

.reading {
  border-color: green;
  background-color: wheat;
}

.cell-input {
  border: none;
  border-radius: 0.25rem;

  background-color: 1px solid #ccc;
  width: 50px;
  margin-left: 0.25rem;
  margin-right: 0.25rem;

  text-align: center;
  font-size: 1rem;
}

textarea {
  border-radius: 0.25rem;
  height: 50vh;
}

.error {
  color: red;
}

.success {
  color: green;
}

.controls {
  display: flex;
  gap: 1rem;
  flex-direction: row;
  justify-content: center;
  align-items: center;
}

hr {
  border-top: 2px solid black;
  border-bottom: none;
}