The burger icon in the navigation bar is malfunctioning, showing just a single horizontal line instead

I've been working on creating a responsive layout button that resembles the following design:

https://i.sstatic.net/v5vDd.png

However, I've encountered an issue where I can't seem to generate all three horizontal lines, only one of them. This is how it currently looks:

https://i.sstatic.net/p21vc.png

This is my code:

HTML

<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
   <span class="navbar-toggler-icon"></span>
</button>

CSS

.navbar-toggler {
  position: relative;
  float: right;
  width: 40px;
  height: 40px;
  margin-top: 5px;
  margin-right: 5px;
  cursor: pointer;
  z-index: 99999;
}

.navbar-toggler span {
  height: 4px;
  background: #545454;
  transition: 0.2s all;
}

.navbar-toggler span:before, .navbar-toggler span:after {
  content: "";
  display: block;
}
htmlcssbootstrap-4navbar

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