<header class="fixed">
  <h1>PENGIN BLOG</h1>
  <nav>
    <ul class="menu-group">
      <li><a href="#">Home</a></li>
      <li><a href="#">News</a></li>
      <li><a href="#">Blog</a></li>
    </ul>
  </nav>
</header>
<main>
  <section class="section">
    <h2 class="text">色が反転して見えるよ</h2>
    <img src="https://drive.google.com/uc?export=view&id=1WRQVpgmW1s5YrzB0iQrMYfbU4MvNiyvH" alt="" />
  </section>
  <section class="section">
    <h2 class="text">色が反転して見えるよ</h2>
    <img src="https://drive.google.com/uc?export=view&id=1T0HWZM16tQRdHcA6Vspor7wa7K9Zh8cQ" alt="" />
  </section>
  <section class="section">
    <h2 class="text">色が反転して見えるよ</h2>
    <img src="https://drive.google.com/uc?export=view&id=10mqA1CfPi8N9_McRCe0bOGR_jUHzPEch" alt="" />
  </section>
  <section class="section">
    <h2 class="text">色が反転して見えるよ</h2>
    <img src="https://drive.google.com/uc?export=view&id=1EnQP6JWlE02lzrcUi0d5zoMihOsWkruG" alt="" />
  </section>
  <section class="section">
    <h2 class="text">色が反転して見えるよ</h2>
    <img src="https://drive.google.com/uc?export=view&id=1bW4fKXZFM_wPHSSf6EewRYX-hV5iNhvu" alt="" />
  </section>
</main>

@import url("https://fonts.googleapis.com/css2?family=Zen+Maru+Gothic:wght@400;700&display=swap");

* {
  box-sizing: border-box;
  font-family: "Arial", "Zen Maru Gothic", sans-serif;
  margin: 0;
  padding: 0;
}

main {
  background-color: #fff;
  padding-top: 4.5em;
}

img {
  height: auto;
  width: 100%;
  vertical-align: bottom;
}

a {
  color: #fff;
  text-decoration: none;
}

.fixed {
  color: #fff;
  display: flex;
  justify-content: space-between;
  mix-blend-mode: difference;
  padding: 16px 40px;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
}

.section {
  margin: 0 auto;
  position: relative;
  z-index: 0;
}

.text {
  color: #fff;
  font-size: 2em;
  font-weight: bold;
  padding: 2em;
  position: absolute;
  top: 0;
}

.menu-group {
  align-items: center;
  display: flex;
  gap: 1.5em;
  height: 100%;
  list-style: none;
}

@media screen and (max-width: 480px) { 
main {
  padding-top: 6.5em;
}
  
.fixed {
  padding: 1em;
}
  
.text {
  padding: 0.5em;
}
}