html,
body {
  height: 100vh;
}
body {
  display: flex;
  background: #fff;
  color: #000;
  font-family: Nunito, sans-serif;
  font-weight: 200;
  font-size: 18px;
  margin: 0;
  padding: 0 20px;
}
main {
  display: flex;
  flex-direction: column;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  flex: 1 1 100%;
}
h1 {
  margin: 0 0 30px 0;
  padding: 0 0 30px 0;
  font-weight: 400;
  font-size: 56px;
  position: relative;
  text-align: center;
}
h1:after {
  display: block;
  content: "";
  height: 1px;
  width: 180px;
  background: silver;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
}
p {
  margin: 0;
  padding: 0;
}
ul {
  display: flex;
  margin: 40px 0 0 0;
  padding: 0;
}
ul li {
  display: flex;
  margin: 0 25px 0 0;
  padding: 0;
}
ul li:last-child {
  margin-right: 0;
}
ul li a {
  font-weight: 400;
  text-decoration: none;
  color: gray;
  transition: color 0.3s;
}
ul li a:hover {
  color: #000;
}
@media (max-width: 640px) {
  h1 {
    font-size: 42px;
  }
  ul {
    flex-direction: column;
  }
  ul li {
    margin-right: 0;
    margin-bottom: 5px;
    justify-content: center;
  }
  ul li:last-child {
    margin-bottom: 0;
  }
}