* {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  box-sizing: border-box;
}

body {
  background-image: linear-gradient(rgb(137, 225, 245), rgb(238, 207, 130));
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  margin: 100px;
  background-color: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
  min-width: 400px;
  justify-content: center;
  align-items: center;
}

.heading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 20px;
}

.heading > img {
  width: 30px;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #edeef0;
  border-radius: 30px;
  padding-left: 20px;
  margin-bottom: 25px;
}

input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  padding: 10px;
}

button {
  border: none;
  outline: none;
  padding: 16px 50px;
  border-radius: 30px;
  background: #ff5945;
  color: #fff;
  font-size: 16px;
  cursor: pointer;
}

Ul li {
  list-style: none;
  font-size: 16px;
  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("img/unchecked.png");
  background-size: cover;
  background-position: center;
  top: 6px;
  left: 8px;
}

ul li.checked {
  color: #555;
  text-decoration: line-through;
}

ul li.checked::before {
  background-image: url("img/checked.png");
}

ul li span {
  position: absolute;
  right: 0;
  top: 2px;
  width: 40px;
  height: 40px;
  font-size: 28px;
  color: #555;
  line-height: 40px;
  text-align: center;
  border-radius: 50%;
}
ul li span:hover {
  background: #edeef0;
}