styles.css

/* CSS Style Sheet */

* {
  margin: 10px;
}

a {
  margin: 0;
}

em {
  margin: 0 !important;
}

strong {
  margin: 0;
}

sup {
  margin: 0;
}

body {
  font-family: 'Open Sans', sans-serif;
  color: #333333;
  background-color: #f2f2f2;
  font-size: 1rem;
  line-height: 1.5;
}

h1 {
  font-size: 2.25rem;
  /* equals 36px */
  font-weight: bold;
  text-align: left;
  margin-top: 2.5rem;
  /* equals 40px */
  margin-bottom: 1.5rem;
  /* equals 24px */
}

h2 {
  font-size: 2rem;
  font-weight: bold;
  text-align: left;
  margin-top: 2.5rem;
  /* equals 40px */
  margin-bottom: 1.5rem;
  /* equals 24px */
}

p {
  font-family: 'Open Sans', sans-serif;
  color: #333333;
  background-color: #f2f2f2;
  font-size: 1rem;
  /* equals 16px */
  line-height: 1.5;
  margin-bottom: 1rem;
}

footer {
  color: gray;
  font-size: 0.9rem;
  text-align: center;
  margin-top: 50px;
  padding: 20px 0;
  border-top: 1px solid #ccc;
}

@media screen and (max-width: 767px) {
  body {
    font-size: 0.875rem;
    /* equals 14px */
  }

  h1 {
    font-size: 1.875rem;
    /* equals 30px */
    margin-top: 2rem;
    margin-bottom: 1rem;
  }

  p {
    font-size: 0.875rem;
    /* equals 14px */
    margin-bottom: 0.5rem;
  }
}


.github-corner:hover .octo-arm {
  animation: octocat-wave 560ms ease-in-out
}

@keyframes octocat-wave {

  0%,
  100% {
    transform: rotate(0)
  }

  20%,
  60% {
    transform: rotate(-25deg)
  }

  40%,
  80% {
    transform: rotate(10deg)
  }
}

@media (max-width:500px) {
  .github-corner:hover .octo-arm {
    animation: none
  }

  .github-corner .octo-arm {
    animation: octocat-wave 560ms ease-in-out
  }
}