.code-frag {
  position: fixed;
  font-family: monospace;
  font-size: 14px;
  opacity: 0.2;
  pointer-events: none;
  z-index: -1;
  transition: opacity 1s ease;
  white-space: nowrap;
}

.code-frag.fade-out {
  opacity: 0;
}

.syntax-keyword  { color: #d73a49; }
.syntax-variable { color: #24292e; }
.syntax-operator { color: #6a737d; }
.syntax-func     { color: #005cc5; }
.syntax-class    { color: #6f42c1; }
.syntax-string   { color: #032f62; }
.syntax-number   { color: #22863a; }