style.css

* {
  margin: 0;
  box-sizing: border-box;
}

body {
  color: white;
  font-family: sans-serif;
}

.wrapper {
  height: 100vh;
  display: grid;
  grid-template-rows: 1fr 1fr;
}

header {
  background-color: #f1c40f;
  display: grid;
  place-content: center center;
}

h1 {
  text-align: center;
  font-size: 4em;
  margin-bottom: 1em;
}

footer {
  background-color: #3498db;
  display: grid;
  grid-template-columns: repeat(7, minmax(40px, auto));
  grid-auto-rows: 60px;
  place-content: start space-around;
}

button {
  margin-top: 20px;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 1em;
  font-size: 1em;
  background-color: #f1c40f;
  color: inherit;
}

button:hover {
  transform: scale(1.2);
}

button:focus {
  outline: 0;
  transform: scale(1.2);
  color: #3498db;
}

ul {
  font-size: 2em;
}

ul li {
  margin-bottom: 8px;
}