body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
  }
  
  header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
  }
  
  .wrapper {
    display: flex;
    justify-content: space-around;
    margin: 20px;
  }
  
  .container {
    flex: 1;
    margin: 10px;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  }
  
  .container-header {
    color: #333;
  }
  
  .form {
    margin-top: 20px;
  }
  
  .form-group {
    margin-bottom: 15px;
  }
  
  label {
    display: block;
    margin-bottom: 5px;
    color: #333;
  }
  
  input[type="text"],
  input[type="date"] {
    width: 100%;
    padding: 10px;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 4px;
    outline: none;
  }
  
  .btn-submit {
    background-color: #333;
    color: #fff;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
  }
  
  .list-item {
    display: flex;
    flex-wrap: wrap;
  }
  
  .item {
    flex: 1 0 23%;
    margin: 10px;
    padding: 15px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.1);
  }
  
  .inner {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .check-button,
  .undo-button,
  .trash-button {
    margin-top: 10px;
    padding: 8px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
  }
  
  .check-button::before,
  .undo-button::before,
  .trash-button::before {
    content: "";
    display: inline-block;
    width: 15px;
    height: 15px;
    margin-right: 5px;
  }
  
  .check-button::before {
    background-color: #4caf50;
  }
  
  .undo-button::before {
    background-color: #2196f3;
  }
  
  .trash-button::before {
    background-color: #f44336;
  }
  
  .check-button span,
  .undo-button span,
  .trash-button span {
    display: inline-block;
  }
  
  footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px;
    position: fixed;
    bottom: 0;
    width: 100%;
  }