html, body {
  height: 100%;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center; 
  font-family: 'Radio Canada', sans-serif;
}

body {
  text-align: center;
  background: linear-gradient(to top, #505285 0%, #585e92 12%, #65689f 25%, #7474b0 37%, #7e7ebb 50%, #8389c7 62%, #9795d4 75%, #a2a1dc 87%, #b5aee4 100%);
}

#todo-container {
  padding: 20px;
  width: 400px;
  background: #f0f0f0;
  border: 1px solid #c1bdbd;
  box-shadow: rgba(0, 0, 0, 0.5) 0px 10px 30px;
  transform: translateY(-150px);
  border-radius: 22px;
  margin-top: 220px;
}

#input-box, #due-date, #input-button {
  margin: 10px 0;
  padding: 10px;
  width: calc(100% - 22px);
  border: 1px solid #c1bdbd;
  border-radius: 5px;
  box-shadow: rgba(0, 0, 0, 0.1) 0px 2px 4px;
}

#input-box:focus, #due-date:focus {
  outline: none;
  border-color: #7474b0;
  box-shadow: 0 0 10px #7474b0;
}

#input-button {
  background: linear-gradient(to top, #505285 0%, #585e92 12%, #65689f 25%, #7474b0 37%, #7e7ebb 50%, #8389c7 62%, #9795d4 75%, #a2a1dc 87%, #b5aee4 100%);
  color: white;
  border: none;
  border-radius: 5px;
  padding: 10px;
  cursor: pointer;
  transition: background 0.3s, transform 0.3s;
}

#input-button:hover {
  background: linear-gradient(to top, #3c4168 0%, #454c7a 12%, #4e5490 25%, #565ca7 37%, #5d63b8 50%, #626bc8 62%, #7a7cd5 75%, #8c8de0 87%, #a2a1dc 100%);
  transform: translateY(-3px);
}

#input-button:active {
  transform: translateY(0);
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

li {
  background: #ddd;
  margin: 5px 0;
  padding: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-radius: 10px;
  box-shadow: rgba(0, 0, 0, 0.1) 0px 2px 4px;
  transition: background 0.3s, transform 0.3s;
}

li:hover {
  background: #ccc;
  transform: translateY(-3px);
}

li.completed {
  text-decoration: line-through;
  color: #888;
}

button {
  background: #7474b0;
  color: white;
  border: none;
  border-radius: 5px;
  padding: 5px 10px;
  cursor: pointer;
  transition: background 0.3s, transform 0.3s;
}

button:hover {
  background: #5d63b8;
  transform: translateY(-3px);
}

button:active {
  transform: translateY(0);
}