.container {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    height: 90vh;
  }
  
  .app-title {
    text-align: center;
    margin-bottom: 20px;
    font-size: 80px;
    opacity: 0.5;
  }
  
  svg {
    width: 64px;
    height: 64px;
  }
  
  .todo-list {
    list-style: none;
    margin-bottom: 20px;
  }
  
  .todo-item {
    margin-bottom: 10px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  
  .todo-item span {
    flex-grow: 1;
    margin-left: 10px;
    margin-right: 10px;
    padding-bottom: 15px;
    font-size: 22px;
  }
  
  .done span {
    text-decoration: line-through;
  }
  
  input[type="checkbox"] {
    display: none;
  }
  
  .tick {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
  }
  
  .tick::before {
    content: '✓';
    font-size: 20px;
    display: none;
  }
  
  .done .tick::before {
    display: inline;
  }
  
  
  form {
    width: 100%;
    display: flex;
    justify-content: space-between;
  }
  
  input[type="text"] {
    width: 100%;
    padding: 10px;
    border-radius: 4px;
    border: 3px solid #333;
  }