<h1>Hello! I  <strong>ღ</strong> W3cplus.com! Go go!</h1>
$square-color: #f4f4f4;
$square-size: 8px;

* {
  box-sizing: border-box;
}
body {
  width: 100vw;
  height: 100vh;
  padding: 2vw;
  line-height: 2;
  background-image:
    linear-gradient(45deg, $square-color 25%, transparent 25%, transparent 75%, $square-color 75%, $square-color), 
    linear-gradient(45deg, $square-color 25%, transparent 25%, transparent 75%, $square-color 75%, $square-color);
  background-position: 0 0, $square-size $square-size;
  background-size: ($square-size * 2) ($square-size * 2);
}

h1 {
  font-size: 3rem;
  color: #f36;
  display:inline-block;
  box-shadow: inset 0 -0.1em #000;
 }
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