html {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-size: 16px;
}

body {
  background-color: #111111;
  color: white;
  font-family: "Open Sans", sans-serif;
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.container > h1 {
  font-size: 2rem;
}

a {
  position: relative;
  mix-blend-mode: difference;
  color: white;
}

a::after {
  content: "";
  height: 100%;
  width: 0%;
  background-color: white;
  position: absolute;
  left: 0;
  transition: width 0.1s ease-in-out;
  mix-blend-mode: difference;
}

a:hover::after {
  width: 100%;
}