.chb30-container {
  max-width: 600px;
  margin: 2rem auto;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
  background-color: #f8f8f8;
  text-align: center;
  border: solid lightseagreen;
}

.chb30-input, 
.chb30-output {
  width: 100%;
  padding: 10px 15px;
  margin-bottom: 15px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 1rem;
  transition: border-color 0.3s;
}

.chb30-input:focus, 
.chb30-output:focus {
  border-color: #007BFF;
  outline: none;
}

.chb30-btn {
  padding: 10px 20px;
  background-color: #007BFF;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.chb30-btn:hover {
  background-color: #0056b3;
}

.chb30-output {
  background-color: #e9ecef;
  color: #333;
}

#serialInput {
  text-transform: uppercase;
}