main.css

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 10px;
  font-family: Helvetica, Arial, sans-serif;
}

h1 {
  font-size: 2.4rem;
  line-height: 3.6rem;
  margin-bottom: 0.6rem;
}

h2 {
  font-size: 1.8rem;
}

h3 {
  font-size: 1.6rem;
}

p {
  font-size: 1.4rem;
}

li {
  font-size: 1.3rem;
  list-style-type: none;
}

h2, h3, p, li {
  line-height: 1.8rem;
  margin-bottom: 0.4rem;
}

a {
  outline: none;
  text-decoration: none;
  padding: 2px 1px 0;
}

a:link {
  color: inherit;
}

a:visited {
  color: #437A16;
}

a:focus {
  border-bottom: 1px solid;
  background: #BAE498;
}

a:hover {
  border-bottom: 1px solid;
  background: #CDFEAA;
}

a:active {
  background: #265301;
  color: #CDFEAA;
}

.wrapper {
  height: 100vh;
  background-color: #bed742;
  background-image: url(https://ws3.sinaimg.cn/large/6f8a2832gy1fqrnfj5nddj21hc0pik7z.jpg);
  background-repeat: no-repeat;
  background-position: center center;
  background-attachment: fixed;
  background-size: cover;
  padding-top: 20px;
}

.main-wrapper {
  width: 60%;
  box-sizing: border-box;
  margin: 0 auto;
  padding: 20px 40px 30px;
  background-color: #fffef9;
}

.logo h1 {
  letter-spacing: 1px;
  color: grey;
}

.logo h2 {
  letter-spacing: 4px;
  font-weight: bold;
}

.logo p {
  letter-spacing: 1px;
  font-style: italic;
}

.project h3 {
  letter-spacing: 1px;
}

.project p {
  letter-spacing: 1px;
}