Consolidando o conhecimento

CSS:

header {
  background: var(--grey-bg-color);
  padding: 20px 0;
}

.box {
  display: flex;
  justify-content: space-around;
}

nav {
  margin-top: 110px;
}

nav li {
  display: inline;
  margin: 0 0 0 15px;
}

nav a {
  text-transform: uppercase;
  color: var(--dark-color);
  font-weight: 700;
  font-size: 22px;
  text-decoration: none;
}

nav a:hover {
  color: var(--hover-menu-color);
  text-decoration: underline;
}

.products {
  display: flex;
  justify-content: space-around;
  width: 1080px;
  margin: 0 auto;
  padding: 50px 0;
}

.products li {
  text-align: center;
  width: 30%;
  margin: 0 1.5%;
  padding: 30px 20px;
  border: 2px solid var(--dark-color);
  border-radius: 10px;
}

.products li:hover {
  border-color: var(--hover-menu-color);
}

.products li:active {
  border-color: var(--active-menu-color);
}
.products li:hover h2 {
  font-size: 34px;
}

.products h2 {
  font-size: 30px;
  font-weight: 700;
}

.product-description {
  font-size: 18px;
}

/* Pega 0 último elemento e aplica as propriedades*/
.products li :last-child {
  font-size: 22px;
  font-weight: bold;
  margin-top: 10px;
}

footer {
  text-align: center;
  background: url("../img/bg.jpg");
  padding: 40px 0;
}

.copyright {
  color: var(--white-bg-color);
  font-size: 13px;
  margin-top: 20px;
}