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Adding Classes

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About the <head>

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CSS

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CSS Base

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HTML 

              
                <main>
  <div>
    <span>discover</span>
    <h1>aquatic animals</h1>
    <hr>
    <p>Beauty and mystery are hidden under the sea. Explore with our application to know about Aquatic Animals.</p>
    <a href="#">download app</a>
  </div>
  <div class="swiper">
    <div class="swiper-wrapper">
      <div class="swiper-slide swiper-slide--one">
        <div>
          <h2>Jellyfish</h2>
          <p>Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria.</p>
          <a href="https://en.wikipedia.org/wiki/Jellyfish" target="_blank">explore</a>
        </div>
      </div>
      <div class="swiper-slide swiper-slide--two">
        <div>
          <h2>Seahorse</h2>
          <p>
            Seahorses are mainly found in shallow tropical and temperate salt water throughout the world. They live in sheltered areas such as seagrass beds, estuaries, coral reefs, and mangroves. Four species are found in Pacific waters from North America to South America.
          </p>
          <a href="https://en.wikipedia.org/wiki/Seahorse" target="_blank">explore</a>
        </div>
      </div>

      <div class="swiper-slide swiper-slide--three">

        <div>
          <h2>octopus</h2>
          <p>
            Octopuses inhabit various regions of the ocean, including coral reefs, pelagic waters, and the seabed; some live in the intertidal zone and others at abyssal depths. Most species grow quickly, mature early, and are short-lived.
          </p>
          <a href="https://en.wikipedia.org/wiki/Octopus" target="_blank">explore</a>
        </div>
      </div>

      <div class="swiper-slide swiper-slide--four">

        <div>
          <h2>Shark</h2>
          <p>
            Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head.
          </p>
          <a href="https://en.wikipedia.org/wiki/Shark" target="_blank">explore</a>
        </div>
      </div>

      <div class="swiper-slide swiper-slide--five">

        <div>
          <h2>Dolphin</h2>
          <p>
            Dolphins are widespread. Most species prefer the warm waters of the tropic zones, but some, such as the right whale dolphin, prefer colder climates. Dolphins feed largely on fish and squid, but a few, such as the orca, feed on large mammals such as seals.
          </p>
          <a href="https://en.wikipedia.org/wiki/Dolphin" target="_blank">explore</a>
        </div>
      </div>
    </div>
    <!-- Add Pagination -->
    <div class="swiper-pagination"></div>
  </div>
  <img src="https://cdn.pixabay.com/photo/2021/11/04/19/39/jellyfish-6769173_960_720.png" alt="" class="bg">
  <img src="https://cdn.pixabay.com/photo/2012/04/13/13/57/scallop-32506_960_720.png" alt="" class="bg2">
</main>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;500;600&family=Roboto:wght@300;400;500;900&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Open Sans", sans-serif;
}

main {
  position: relative;
  width: calc(min(90rem, 90%));
  margin: 0 auto;
  min-height: 100vh;
  column-gap: 3rem;
  padding-block: min(20vh, 3rem);
}

.bg {
  position: fixed;
  top: -4rem;
  left: -12rem;
  z-index: -1;
  opacity: 0;
}

.bg2 {
  position: fixed;
  bottom: -2rem;
  right: -3rem;
  z-index: -1;
  width: 9.375rem;
  opacity: 0;
}

main > div span {
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-size: 1rem;
  color: #717171;
}

main > div h1 {
  text-transform: capitalize;
  letter-spacing: 0.8px;
  font-family: "Roboto", sans-serif;
  font-weight: 900;
  font-size: clamp(3.4375rem, 3.25rem + 0.75vw, 4rem);
  background-color: #005baa;
  background-image: linear-gradient(45deg, #005baa, #000000);
  background-size: 100%;
  background-repeat: repeat;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  -moz-background-clip: text;
  -moz-text-fill-color: transparent;
}

main > div hr {
  display: block;
  background: #005baa;
  height: 0.25rem;
  width: 6.25rem;
  border: none;
  margin: 1.125rem 0 1.875rem 0;
}

main > div p {
  line-height: 1.6;
}

main a {
  display: inline-block;
  text-decoration: none;
  text-transform: uppercase;
  color: #717171;
  font-weight: 500;
  background: #fff;
  border-radius: 3.125rem;
  transition: 0.3s ease-in-out;
}

main > div > a {
  border: 2px solid #c2c2c2;
  margin-top: 2.188rem;
  padding: 0.625rem 1.875rem;
}

main > div > a:hover {
  border: 0.125rem solid #005baa;
  color: #005baa;
}

.swiper {
  width: 100%;
  padding-top: 3.125rem;
}

.swiper-pagination-bullet,
.swiper-pagination-bullet-active {
  background: #fff;
}

.swiper-pagination {
  bottom: 1.25rem !important;
}

.swiper-slide {
  width: 18.75rem;
  height: 28.125rem;
  display: flex;
  flex-direction: column;
  justify-content: end;
  align-items: self-start;
}

.swiper-slide h2 {
  color: #fff;
  font-family: "Roboto", sans-serif;
  font-weight: 400;
  font-size: 1.4rem;
  line-height: 1.4;
  margin-bottom: 0.625rem;
  padding: 0 0 0 1.563rem;
  text-transform: uppercase;
}

.swiper-slide p {
  color: #dadada;
  font-family: "Roboto", sans-serif;
  font-weight: 300;
  padding: 0 1.563rem;
  line-height: 1.6;
  font-size: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.swiper-slide a {
  margin: 1.25rem 1.563rem 3.438rem 1.563rem;
  padding: 0.438em 1.875rem;
  font-size: 0.9rem;
}

.swiper-slide a:hover {
  color: #005baa;
}

.swiper-slide div {
  display: none;
  opacity: 0;
  padding-bottom: 0.625rem;
}

.swiper-slide-active div {
  display: block;
  opacity: 1;
}

.swiper-slide--one {
  background: linear-gradient(to top, #0f2027, #203a4300, #2c536400),
    url("https://images.unsplash.com/photo-1628944682084-831f35256163?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=687&q=80")
      no-repeat 50% 50% / cover;
}

.swiper-slide--two {
  background: linear-gradient(to top, #0f2027, #203a4300, #2c536400),
    url("https://images.unsplash.com/photo-1515309025403-4b0184873cef?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=735&q=80")
      no-repeat 50% 50% / cover;
}

.swiper-slide--three {
  background: linear-gradient(to top, #0f2027, #203a4300, #2c536400),
    url("https://images.unsplash.com/photo-1545671913-b89ac1b4ac10?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1170&q=80")
      no-repeat 50% 50% / cover;
}

.swiper-slide--four {
  background: linear-gradient(to top, #0f2027, #203a4300, #2c536400),
    url("https://images.unsplash.com/photo-1598977123118-4e30ba3c4f5b?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1170&q=80")
      no-repeat 50% 50% / cover;
}

.swiper-slide--five {
  background: linear-gradient(to top, #0f2027, #203a4300, #2c536400),
    url("https://images.unsplash.com/photo-1570481662006-a3a1374699e8?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=765&q=80")
      no-repeat 50% 50% / cover;
}

.swiper-3d .swiper-slide-shadow-left,
.swiper-3d .swiper-slide-shadow-right {
  background-image: none;
}

@media screen and (min-width: 48rem) {
  main {
    display: flex;
    align-items: center;
  }
  .bg,
  .bg2 {
    opacity: 0.1;
  }
}

@media screen and (min-width: 93.75rem) {
  .swiper {
    width: 85%;
  }
}
!

JS 

              
                /*
inspiration
https://dribbble.com/shots/4684682-Aquatic-Animals
*/

var swiper = new Swiper(".swiper", {
  effect: "coverflow",
  grabCursor: true,
  centeredSlides: true,
  coverflowEffect: {
    rotate: 0,
    stretch: 0,
    depth: 100,
    modifier: 3,
    slideShadows: true
  },
  keyboard: {
    enabled: true
  },
  mousewheel: {
    thresholdDelta: 70
  },
  loop: true,
  pagination: {
    el: ".swiper-pagination",
    clickable: true
  },
  breakpoints: {
    640: {
      slidesPerView: 2
    },
    768: {
      slidesPerView: 1
    },
    1024: {
      slidesPerView: 2
    },
    1560: {
      slidesPerView: 3
    }
  }
});
!
999px

Console