body {
  margin: 0;
  text-align: center;
  display: flex;
  flex-flow: column;
  align-items: center;
  background-color: rgb(23 , 131 , 134);
}

header {
  font-size: x-large;
  margin-top: 20px;
  color: bisque;
  font-weight: 800;
}

main {
  max-width: 100%;
  background-color: bisque;
  border-radius: 20px;
  padding: 20px;
}

#funcionamento {
  font-size: large;
  margin-top: 20px;
  color: rgb(23 , 131 , 134);
  font-weight: 800;
  padding: 20px;
}

li {
  font-size: large;
  margin-top: 5px;
  color: rgb(23 , 131 , 134);
  font-weight: 800;
  text-align: justify;
}

.selected {
  background-color: gray;
}

.completed {
  text-decoration: line-through solid black;
}

button {
  border-radius: 5px;
}

footer {
  margin-top: 100px;
  padding: 10px;
  color: bisque;
  font-weight: 800;
}