#mm-to-inches-form {
  margin: 20px auto;
  max-width: 400px;
  padding: 10px;
  background-color: #f8f8f8;
  border: 1px solid #ccc;
  border-radius: 5px;
  box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
  text-align: center;
}

#inches-output {
  margin-top: 10px;
  font-size: 24px;
  font-weight: bold;
}

#inches-output em {
  font-size: 14px;
  font-weight: normal;
}

#mm-input {
  border-radius: 3px;
  border: 1px solid #ccc;
  padding: 5px;
  font-size: 16px;
  margin-right: 10px;
  text-align: center;
}

#mm-input:focus {
  outline: none;
  border-color: #4CAF50;
}

input[type="submit"] {
  border-radius: 3px;
  border: none;
  background-color: #4CAF50;
  color: #fff;
  padding: 5px 10px;
  font-size: 16px;
  cursor: pointer;
}

input[type="submit"]:hover {
  background-color: #3e8e41;
}

input[type="submit"]:focus {
  outline: none;
}