HTML Bootstrap Carousel (carousel-control)

About the issue that currently facing is that for Bootstrap Carousel (from w3school) , there is a problem for carousel-control.

Problem that i am facing is that when i have enter hyperlink for the image , the carousel-control are larger then the image itself (screenshot below).

Screenshot: https://prnt.sc/r4wh2f

Codes for my bootstrap carousel

<div class="row">
<div class="col-12 col-md-12 banner-section">
<div class="container">
  <div id="myCarousel" class="carousel slide" data-ride="carousel">
    <!-- Indicators -->
    <ol class="carousel-indicators">
      <li data-target="#myCarousel" data-slide-to="0" class="active"></li>
      <li data-target="#myCarousel" data-slide-to="1"></li>
    </ol>

    <!-- Wrapper for slides -->
    <div class="carousel-inner">
      <div class="item active">
                <a href="facebook.com"><picture>
            <source media="(max-width: 900px)" srcset="image/banner01small.jpg">
            <img src="image/banner01" alt="banner" style="z-index:1" class="img-fluid">
        </picture></a>
      </div>

      <div class="item">
                <a href="instagram.com"><picture>
            <source media="(max-width: 900px)" srcset="image/banner02small.jpg">
            <img src="image/banner02" alt="banner" style="z-index:1" class="img-fluid">
        </picture></a>
      </div>
    </div>

    <!-- Left and right controls -->
    <a class="left carousel-control" href="#myCarousel" data-slide="prev">
      <span class="glyphicon glyphicon-chevron-left"></span>
      <span class="sr-only">Previous</span>
    </a>
    <a class="right carousel-control" href="#myCarousel" data-slide="next">
      <span class="glyphicon glyphicon-chevron-right"></span>
      <span class="sr-only">Next</span>
    </a>
  </div>
</div>
</div>
</div>