.page-node-37012 .l-hero {
    background: url(/sites/default/files/styles/hero_image/public/header-imgs/page/example-hero-image-for-webinar-registration.png);
   height: 600px; /* You must set a specified height */
  background-position: center; /* Center the image */
  background-repeat: no-repeat; /* Do not repeat the image */
  background-size: cover; /* Resize the background image to cover the entire container */
}

.page-node-37012 p {
     font-size: 1.3rem;
}