.todo-app {
  width: 100%;
  max-width: 540px;
  background: transparent;
  margin: 100px auto 20px;
  padding: 40px 30px 70px;
  border-radius: 10px;
}
.todo-app h2 {
  color: #fff;
  display: flex;
  align-items: center;
  margin-bottom: 20px;
}
.todo-app h2 img {
  width: 30px;
  margin-left: 10px;
}
.row {
  display: flex;
  align-items: center;
  gap: 8px; /* space between input and button */
  max-width: 100%; /* container adapts full width */
  width: 100%; /* take full width of parent */
  padding: 0 10px; /* optional padding */
  box-sizing: border-box;
}

.row input {
  flex-grow: 1; /* input takes all remaining space */
  padding: 10px;
  font-size: 16px;
  border-radius: 30px;
  border: 1px solid #ccc;
  outline: none;
}

.row button {
  padding: 10px 20px;
  font-size: 16px;
  border-radius: 30px;
  border: none;
  background-color: #4e085f;
  color: white;
  cursor: pointer;
  flex-shrink: 0; /* button size fixed, doesn't shrink */
  transition: background-color 0.3s ease;
}

.row button:hover {
  background-color: #a0522d;
}
.white-text {
  /*text color */
  color: white;
}
ul li {
  list-style: none;
  font-size: 17px;
  padding: 12px 8px 12px 50px;
  user-select: none;
  cursor: pointer;
  position: relative;
}
ul li::before {
  content: "";
  position: absolute;
  height: 28px;
  width: 28px;
  border-radius: 50%;
  background-image: url(images/unchecked.png);
  background-size: cover;
  background-position: center;
  top: 12px;
  left: 8px;
}
ul li.checked {
  color: antiquewhite;
  text-decoration: line-through;
}
ul li.checked::before {
  content: "";
  position: absolute;
  height: 28px;
  width: 28px;
  border-radius: 50%;
  background-image: url(images/checked.png);
  background-size: cover;
  background-position: center;
  top: 12px;
  left: 8px;
}
ul li span {
  position: absolute;
  right: 0;
  top: 5px;
  width: 40px;
  height: 40px;
  font-size: 22px;
  color: #555;
  line-height: 40px;
  text-align: center;
  border-radius: 50%;
  transition: 0.5s;
}
ul li span:hover {
  background: red;
}