@font-face {
  font-family: "Courier";
  src: url("../fonts/Courier\ New.woff2") format("woff2");
}

* {
  font-weight: 400;
  margin: 0;
  padding: 0;
  font-size: 28px;
  font-family: 'Courier';
}

a {
  display: inline-block;
  text-decoration: none;
  color: blue;
}

body {
  padding: 1rem;
  box-sizing: border-box;
}

header {
  margin-bottom: 1rem;
}

h1 {
  text-transform: uppercase;
  letter-spacing: 0.3333333em;
}

h2 {
  margin-bottom: 1rem;
}

h3 {
  margin-bottom: 1rem;
}

ul {
  padding: 0rem 0;
}

li {
  list-style: none;
}

.register {
  margin-bottom: 1rem;
}

a {
  animation: shake 0.3s;
  animation-iteration-count: infinite;
}

@keyframes shake {
  0% { transform: rotate(0deg); }
  25% { transform: rotate(3deg); }
  50% { transform: rotate(0deg); }
  75% { transform: rotate(-3deg); }
  100% { transform: rotate(0deg); }
}

aside {
  margin: 1rem 0;
}

@media only screen and (max-width: 850px) {
  * {
    font-size: 18px;
  }

  body {
    padding: 0.5rem;
  }
}