body, input, button {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
  }
  
  #app {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
  }
  
  .screen {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  ul {
    list-style-type: none;
    padding: 0;
    width: 100%;
  }
  
  button {
    padding: 10px;
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
  }
  
  button:hover {
    background-color: #0056b3;
  }
  
  .panel {
    flex: 1;
    margin: 10px;
  }
  
  .editor-panels {
    display: flex;
    width: 100%;
  }
  
  h2, h3 {
    margin-top: 0;
  }