body, html {
  font-family: sans-serif;
  font-size: 18px;
}

body {
 font-size: 18px;
}
h1,h2,h3,h4,h5,h6,p {
 line-height: 1.45;
}
h1 { font-size: 4em; }
h2 { font-size: 3em; }

Raise font size and line-heights
Raise font size and line-heights
