styles.css

* {
  font-size: 20px;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}

h1 {
  color: blue;
  font-size: 2rem;
}

button {
  background-color: lightgreen;
  cursor: pointer;
  margin: 0.5rem;
  max-width: 100px;
}
input {
  background-color: lightgreen;
  border: none;
  border-radius: 4px;
  color: black;
  cursor: pointer;
  margin: 8px 0;
  padding: 14px 20px;
  width: 80%;
}

header {
  align-items: center;
  display: flex;
}

i {
  color: green;
  font-size: 2rem !important;
  margin-left: 2rem;
}

.container {
  background-color: #ddd;
  margin: 2rem auto;
  padding: 2rem;
  max-width: 1000px;
}

.form__container {
  align-items: center;
  border: 2px solid blue;
  border-radius: 1rem;
  display: flex;
  flex-direction: column;
  margin: auto;
  max-width: 800px;
  padding: 2rem;
}

.itemList {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  height: 10rem;
}

.popularItemsSection {
  display: flex;
  justify-content: space-between;
  max-width: 200px;
}

.itemRemoved {
  text-decoration: line-through;
}

.warning__container {
  height: 1rem;
}

.warning {
  color: red;
}