body, html
{
  margin: 0;
  padding: 0;
  font-family: 'Roboto', sans-serif;
  background-color: #f0f0f0;
  font-size: 20px
}

.container
{
  max-width: 800px;
  margin: 20px auto;
  background-color: #fff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1
{
  text-align: center;
  color: #333;
}

h2
{
  color: #555;
  border-bottom: 2px solid #ccc;
  padding-bottom: 5px;
}

.category
{
  margin-bottom: 20px;
}

.task-list
{
  list-style-type: none;
  padding: 0;
}

.task-list li
{
  margin-bottom: 5px;
  background-color: #f9f9f9;
  padding: 10px;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.task-list li.completed
{
  text-decoration: line-through;
}

.task-list li:hover
{
  background-color: #e0e0e0;
  cursor: pointer;
}