body {
  width: 980px;
  margin: 0 auto;
  text-align: center;
  font-size: 28px;
  font-family: "Open Sans", sans-serif;
}

header {
  margin-top: 20px;
  border-top: 2px solid black;
  border-right: 2px solid black;
  border-left: 2px solid black;
}

h1 {
  margin: 0;
  font-size: 4.9rem;
  text-transform: uppercase;
}

h2.subheading {
  margin-top: -122px;
  font-size: 1.4rem;
  text-transform: uppercase;
}

ul {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin: 0 0 0 23px;
  padding: 0;
}

ul li {
  margin: 0 15px 0 10px;
  padding: 0 10px 0 0;
  font-size: 1.4rem;
  font-weight: 700;
}

main {
  padding-bottom: 20px;
  border-left: 2px solid black;
  border-right: 2px solid black;
}

.footer-top {
  margin-bottom: 20px;
  padding-bottom: 10px;
  background-color: black;
  color: white;
}

.footer-top .footer-row {
  display: flex;
  padding: 0 15px;
  justify-content: space-between;
  align-items: center;
}

.footer-top .footer-row h3 {
  padding: 0;
  margin: 0;
  font-size: 3.5rem;
}

.footer-top .footer-row p.experience {
  width: 200px;
  margin: 0;
  font-size: 24px;
  line-height: 1em;
}

.footer-top .footer-row ul {
  justify-content: space-around;
  width: 100%;
}

.footer-top .footer-row ul li {
  font-size: 1.1rem;
}

.footer-top .footer-row ul li:first-of-type {
  list-style: none;
}

.phone {
  color: white;
  text-decoration: none;
}

.phone:hover, .phone:active {
  text-decoration: underline;
}

img.stairs {
  width: 100%;
}

.mobile-only {
  display: none;
}

.desktop-only {
  display: block;
}

@media all and (max-width: 980px) {
  body {
    width: 100%;
  }
  header, main {
    border: none;
  }
  h1 {
    font-size: 2rem;
  }
  img.stairs {
    width: 100%;
    margin-bottom: 10px;
  }
  h2.subheading {
    margin-top: 0;
  }
  .mobile-only {
    display: block;
  }
  .desktop-only {
    display: none;
  }
  .footer-top .footer-row {
    flex-direction: column;
  }
  ul li {
    width: 100%;
    list-style: none;
  }
  .phone {
    font-size: 2.5rem;
  }
}