<section class="hero">
  <div class="hero__image-wrapper">
    <img id="hero__image" src="https://picsum.photos/1280/720" alt="Picsum placeholder image" />
  </div>
  <div class="hero__text">
    <h1>Can't see text over an image?</h1>
    <p>Fear not! Darkening the image behind the text will make the text much easier to see!</p>
    <button id="hero__img-refresh">Refresh Image</button>
  </div>
</section>

body {
  margin: 0px;
}

.hero {
  display: flex;
  position: relative;
  align-items: center;
  justify-content: center;
  width: 100vw;
  max-width: 1280px;
  height: 100vh;
  max-height: 720px;
  margin: 0 auto;
  color: #fff;
  text-align: center;
}

.hero:after {
  z-index: 0;
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.4);
  content: "";
}

.hero__image-wrapper {
  display: flex;
  position: absolute;
  width: 100%;
  height: 100%;
}

#hero__image {
  width: auto;
  min-width: 100%;
  height: auto;
  min-height: 100%;
  object-fit: cover;
}

.hero__text {
  z-index: 1;
  max-width: 100%;
  padding: 20px 5%;
}

.hero__text h1 {
  margin: 0 0 24px;
  font-family: "Merriweather", serif;
  font-size: 50px;
  line-height: 1.3;
}

.hero__text p {
  margin: 0px 0px 40px;
  font-family: "Lato", sans-serif;
  font-size: 26px;
  line-height: 1.3;
}

#hero__img-refresh {
  padding: 14px 20px;
  border: 2px solid #fff;
  border-radius: 5px;
  background-color: rgba(0, 0, 0, 0.4);
  color: #fff;
  font-family: "Lato", sans-serif;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  transition: 0.3s;
}

#hero__img-refresh:hover {
  background-color: rgba(0, 0, 0, 0.7);
}

@media only screen and (max-width: 768px) {
  .hero__text h1 {
    margin: 0 0 16px;
    font-size: 40px;
  }

  .hero__text p {
    margin: 0px 0px 48px;
    font-size: 22px;
  }

  #hero__img-refresh {
    font-size: 18px;
  }
}

var imgRefreshBtn = document.getElementById("hero__img-refresh");

// Update the picsum image source on btn click
imgRefreshBtn.onclick = function () {
  document.getElementById("hero__image").src =
    "https://picsum.photos/1280/720?rand=" + new Date().getTime();
};