Swiper JS, Slides grow enormously big on mobile phone

document.addEventListener('DOMContentLoaded', function() {
  const swiperElement = document.querySelector('.swiper-container');

  if (swiperElement !== null) {
    new Swiper(swiperElement, {
      slidesPerView: 1, // Default to 1 slide per view
      direction: 'horizontal',
      navigation: {
        nextEl: '.swiper-button-next',
        prevEl: '.swiper-button-prev',
      },
      autoplay: false,
      pagination: {
        el: '.swiper-pagination',
        clickable: true,
      },
      breakpoints: {
        768: {
          slidesPerView: 2, // 2 slides per view for screens wider than 768px
        }
      }
    });
  } else {
    console.error('[swiper] Element with class "swiper-container" not found.');
  }
});

.memberships-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  width: 100%;
}

.swiper-container {
  width: 100%;
  height: 300px;
  box-sizing: border-box;
  /* height: 100%; */
  overflow: hidden;
}

.swiper-wrapper {
  display: flex;
  flex-wrap: nowrap;
  overflow: hidden;
}

.swiper-button-prev,
.swiper-button-next {
  color: rgba(208, 0, 123, 1) !important;
}

.swiper-slide {
  /* display: flex;
    justify-content: center;
    align-items: center;
    width: 100%; */
  box-sizing: border-box;
  width: 100%;
}

@media (min-width: 768px) {
  .swiper-slide {
    width: 50%;
    /* Two slides per view for larger screens */
  }
}

.swiper-pagination {
  width: 100%;
}

.memberships-container .membership-tile {
  position: relative;
  border: 3px solid rgba(208, 0, 123, 1);
  display: flex;
  justify-content: center;
  z-index: 1;
  background-color: #f8f8f8;
  padding: 15px;
}

.memberships-container .membership-tile.premium-fit-fital {
  border: 3px solid rgba(194, 98, 39, 1);
}

.memberships-container .membership-tile .membership-title-container {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
}

.memberships-container .membership-tile .membership-title {
  color: rgba(208, 0, 123, 1);
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.25);
  font-family: 'Avenir Black';
  font-weight: 600;
  font-size: 25px;
  text-transform: uppercase;
  text-align: center;
  white-space: nowrap;
  /* position: absolute; */
  /* top: -15px; */
  display: block;
  /* background-color: white; */
  /* background: rgb(255,255,255); */
  background: linear-gradient(180deg, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 1) 50%, rgba(248, 248, 248, 1) 100%);
}

.memberships-container .membership-tile.premium-fit-fital .membership-title {
  color: rgba(194, 98, 39, 1);
}

.memberships-container .membership-tile .price {
  font-size: 22px;
  font-family: 'Avenir Black';
  font-weight: 600;
}

.memberships-container .membership-tile .payment-description {
  margin-left: 5px;
  font-size: 18px;
  font-family: 'Avenir Black';
  font-weight: 600;
}

.memberships-container .membership-tile .usp-list {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

.memberships-container .membership-tile .usp-list li {
  font-size: 14px;
  font-family: 'Avenir Black';
  font-weight: 500;
}

.memberships-container .membership-tile .usp-list li:before {
  font-family: "Font Awesome 6 Free";
  content: "f00c";
  font-weight: 700;
  color: rgba(208, 0, 123, 1);
  margin-right: 5px;
}

.memberships-container .membership-tile.premium-fit-fital .usp-list li:before {
  color: rgba(194, 98, 39, 1);
}

.memberships-container .membership-tile .btn-box {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.memberships-container .membership-tile .more-info {
  font-family: 'Avenir Black';
  font-weight: 400;
  color: rgba(208, 0, 123, 1);
  text-decoration: underline;
  font-size: 18px;
}

.memberships-container .membership-tile.premium-fit-fital .more-info {
  color: rgba(194, 98, 39, 1);
}

.memberships-container .membership-tile .fake-btn {
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 200px;
  font-size: 16px;
  background-color: rgba(208, 0, 123, 1);
  color: white;
  text-decoration: none;
  font-weight: 400;
  font-family: "Avenir Light";
  box-sizing: border-box;
  border: 2px solid transparent;
  text-transform: uppercase;
}

.memberships-container .membership-tile .fake-btn:hover {
  background: none;
  border: 3px solid rgba(208, 0, 123, 1);
  color: rgba(208, 0, 123, 1);
  font-weight: 600;
  cursor: pointer;
}

.memberships-container .membership-tile.premium-fit-fital .fake-btn {
  background-color: rgba(194, 98, 39, 1);
}

.memberships-container .membership-tile input[type="radio"] {
  display: none;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/Swiper/11.0.5/swiper-bundle.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/Swiper/11.0.5/swiper-bundle.css">
<div class="swiper-container swiper-initialized swiper-horizontal swiper-ios swiper-backface-hidden">
  <fieldset name="membershipType" class="memberships-container mb-5 swiper-wrapper" id="swiper-wrapper-351467fcc9ba769a" aria-live="polite" style="transition-duration: 0ms; transition-delay: 0ms; transform: translate3d(0px, 0px, 0px);">

    <div class="swiper-slide swiper-slide-active" style="width: 3.35544e+07px;" role="group" aria-label="1 / 2">
      <div class="membership-tile">
        <div class="membership-card">
          <div class="membership-title-container">
            <h2 class="membership-title">Platinum</h2>
          </div><span class="price">€&nbsp;59,99</span><span class="payment-description">Per 4 weken</span><span class="action-description"></span>
          <ul class="hidden"></ul>
          <div class="btn-box"><span class="more-info">Meer info</span><span class="fake-btn">Selecteer</span></div><input type="radio" name="membershipType" class="membershipType" value="Platinum"></div>
      </div>
    </div>
    <div class="swiper-slide swiper-slide-next" role="group" aria-label="2 / 2" style="width: 3.35544e+07px;">
      <div class="membership-tile">
        <div class="membership-card">
          <div class="membership-title-container">
            <h2 class="membership-title">Platinum student</h2>
          </div><span class="price">€&nbsp;59,99</span><span class="payment-description">Per 4 weken</span><span class="action-description"></span>
          <ul class="hidden"></ul>
          <div class="btn-box"><span class="more-info">Meer info</span><span class="fake-btn">Selecteer</span></div><input type="radio" name="membershipType" class="membershipType" value="Platinum student"></div>
      </div>
    </div>
  </fieldset>
  <!-- <div class="swiper-pagination"></div> -->
  <div class="swiper-button-next" tabindex="0" role="button" aria-label="Next slide" aria-controls="swiper-wrapper-351467fcc9ba769a" aria-disabled="false"></div>
  <div class="swiper-button-prev swiper-button-disabled" tabindex="-1" role="button" aria-label="Previous slide" aria-controls="swiper-wrapper-351467fcc9ba769a" aria-disabled="true"></div>
  <span class="swiper-notification" aria-live="assertive" aria-atomic="true"></span></div>