Horizontal scroll areas with buttons and gradients

// Show and hide gradients

$(document).ready(function() {
  $(".scroll-area").each(function(index) {
    if ($(this)[0].scrollWidth <= $(this)[0].clientWidth) {
      $(this).closest(".container").find(".left").css("display", "none");
      $(this).closest(".container").find(".right").css("display", "none");
    } else {
      $(this).scroll(function() {
        if ($(this)[0].scrollWidth > $(this)[0].clientWidth) {
          if ($(this).scrollLeft() > 0) {
            $(this).closest(".container").find(".left").css("display", "block");
          }

          if ($(this).scrollLeft() == 0) {
            $(this).closest(".container").find(".left").css("display", "none");
          }

          var fullWidth = $(this)[0].scrollWidth - $(this)[0].offsetWidth - 1;

          if ($(this).scrollLeft() >= fullWidth) {
            $(this).closest(".container").find(".right").css("display", "none");
          }

          if ($(this).scrollLeft() < fullWidth) {
            $(this).closest(".container").find(".right").css("display", "block");
          }
        }
      });
    }
  });
});


// Scroll buttons

let interval;

$('.scroll-btn').on('mousedown', ({
  target
}) => {
  const type = $(target).attr('id');

  interval = setInterval(() => {
    var x = $('#a').scrollLeft();
    $('#a').scrollLeft(type === 'left-arrow' ? x - 10 : x + 10);
  }, 50);
});

$('.scroll-btn').on('mouseup', () => clearInterval(interval));

* {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  font-size: 16px;
}

.container {
  width: 550px;
  height: 80px;
  background-color: grey;
  position: relative;
  margin-bottom: 20px;
}

.scroll-area {
  white-space: nowrap;
  overflow-x: auto;
  height: 100%;
}

.left,
.right {
  width: 50px;
  height: 100%;
  position: absolute;
  pointer-events: none;
  top: 0;
}

.left {
  background: linear-gradient(90deg, orange 0%, rgba(0, 0, 0, 0) 100%);
  left: 0;
  display: none;
}

.right {
  background: linear-gradient(-90deg, orange 0%, rgba(0, 0, 0, 0) 100%);
  right: 0;
}

.arrow {
  display: block;
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  width: 15px;
  cursor: pointer;
}

.left-arrow {
  left: 0;
}

.right-arrow {
  right: 0;
}

.left-arrow div,
.right-arrow div {
  font-size: 40px;
}

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>

<div class="container">

  <div id="x" class="left"></div>
  <div class="right"></div>

  <div class="arrow left-arrow">
    <div class="scroll-btn" id="left-arrow">
      <</div>
    </div>
    <div class="arrow right-arrow">
      <div class="scroll-btn" id="right-arrow">></div>
    </div>

    <div id="a" class="scroll-area">
      <div class="text">Scroll to right. The gradients and arrows should appear and disappear based on the scroll position. It should work with more than one container. Lorem ipsum.</div>
    </div>
  </div>