body {
  background-color: lightgray;
  font-family: sans-serif;
}

.main-content {
  background-color: white;
  width: 80%;
  max-width: 400px;
  margin: 20px auto 20px auto;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
}

h1 {
  text-align: center;
}

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

.todo-list li {
  background-color: lightblue;
  margin-bottom: 12px;
  padding: 8px;
  border-radius: 8px;
}

.sub-item {
  list-style-type: square;
}

.sub-item-link {
  text-decoration: none;
  color: darkcyan;
}

.sub-item-link:hover {
  color: dodgerblue;
}

.sub-item-link:focus {
  outline: black;
}

.sub-item-link:visited {
  color: slateblue;
}

.sub-item-link:active {
  color: white;
}