<div id=demo>
  <div> RETRO! </div>
</div>

#demo 
{
  width: 500px;
  height: 300px;
  color: #FFD700;
  background-image: linear-gradient(90deg, currentColor 50%, black 50%);
  background-size: 4px;
  margin: auto;
  margin-top: 24px;
}
#demo div 
{
  height: 100%;
  line-height: 300px;
  text-align: center;
  font-size: 90px;
  font-weight: bolder;
}