body {
  font-family: "Montserrat", Arial, sans-serif;
  background-image: linear-gradient(to right, #4776e6, #8e54e9);
  margin: 0;
  padding: 0;
}

.container {
  max-width: 400px;
  padding: 30px;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  animation: fadeIn 0.5s ease;
  margin: 20px auto;
  overflow-y: auto;
  max-height: calc(100vh - 100px);
}

.input-container {
  position: sticky;
  top: 0;
  background-color: #fff;
  z-index: 1;
  padding-bottom: 10px;
}

input {
  width: calc(100% - 80px);
  padding: 12px;
  margin-bottom: 15px;
  border: none;
  border-radius: 5px;
  background-color: #f4f4f4;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  font-size: 16px;
}

button {
  width: calc(100% - 24px);
  padding: 12px;
  background-image: linear-gradient(to right, #4776e6, #8e54e9);
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
  display: block;
  margin-top: 15px;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 8px rgba(0, 0, 0, 0.1);
}

ul {
  padding: 0;
  list-style-type: none;
  margin-top: 10px;
}

li {
  position: relative;
  list-style: none;
  padding-left: 25px;
  margin-bottom: 10px;
  padding: 10px;
  background-color: #f4f4f4;
  border-radius: 5px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  animation: slideIn 0.5s ease;
  cursor: pointer;
}

li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  border: 2px solid #ccc;
  border-radius: 3px;
}

li.completed::before {
  background-color: #4776e6;
}

li span {
  margin-left: 30px;
}

@keyframes slideIn {
  0% {
    opacity: 0;
    transform: translateX(-20px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}