body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  margin: 0;
  padding: 0;
}
.container {
  width: 80%;
  margin: 50px auto;
  background-color: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
h1 {
  text-align: center;
  color: #333;
}
input[type="text"] {
  width: 70%;
  padding: 10px;
  font-size: 16px;
}
button {
  padding: 10px;
  font-size: 16px;
  background-color: #28a745;
  color: #fff;
  border: none;
  cursor: pointer;
}
button:hover {
  background-color: #218838;
}
.task {
  padding: 15px;
  background-color: #f9f9f9;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-radius: 5px;
}
.completed span {
  text-decoration: line-through;
  color: #888;
}
.supp,
.modif {
  background-color: #dc3545;
  color: #fff;
  padding: 5px 10px;
  border: none;
  cursor: pointer;
  margin-left: 5px;
}
.modif {
  background-color: #ffc107;
}
.supp:hover {
  background-color: #c82333;
}
.modif:hover {
  background-color: #e0a800;
}