Bootstrap 4 Carousel Indicators are not appearing - html

Question

I'm trying to create a carousel slider with carousel indicators at the bottom using Bootstrap-4.1.3. The problem is that the carousel indicators are invisible, but they do work when you click them.
I've already tried z-index, and background colors on the indicators, but they don't seem to work.
Here is my code:
.carousel-indicators {
z-index: 3;
#slide-buttons {
background-color: #999 !important;
background-color: rgba(70, 70, 70, .25) !important;
}
.active {
background-color: #444 !important;
}
}
<div class="carousel slide col-9 mx-auto pt-5 position-relative" data-ride="carousel" id="slides">
<!--Carousel Content-->
<div class="carousel-content carousel-inner" role="listbox">
<div class="slide-1 col-12 carousel-item active" id="slide1">
<h5>Example</h5>
</div>
<div class="slide-2 col-12 carousel-item" id="slide2">
<h5>Example</h5>
</div>
<div class="slide-3 col-12 carousel-item" id="slide3">
<h5>Example</h5>
</div>
</div>
<!-- Carousel Indicators -->
<ul class="carousel-indicators mt-5 pt-5 ">
<li data-target="#slides" id="slides-buttons" data-slide-to="0" class="active"></li>
<li data-target="#slides" id="slides-buttons" data-slide-to="1" class=" "></li>
<li data-target="#slides" id="slides-buttons" data-slide-to="2" class=" "></li>
</ul>
</div>

Answer 1

You should not use the same id multiple times on your page. Try using this solution instead:
.carousel .carousel-indicators li {
background-color: red;
}
.carousel .carousel-indicators li.active {
background-color: blue;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/js/bootstrap.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>
<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
<ol class="carousel-indicators">
<li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
<li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
<li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
</ol>
<div class="carousel-inner">
<div class="carousel-item active">
<img class="d-block w-100" src="https://cdn.pixabay.com/photo/2016/06/18/17/42/image-1465348_1280.jpg" alt="First slide">
</div>
<div class="carousel-item">
<img class="d-block w-100" src="https://cdn.pixabay.com/photo/2016/06/18/17/42/image-1465348_1280.jpg" alt="Second slide">
</div>
<div class="carousel-item">
<img class="d-block w-100" src="https://cdn.pixabay.com/photo/2016/06/18/17/42/image-1465348_1280.jpg" alt="Third slide">
</div>
</div>
<a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>

Answer 2

There is a typepo error in your code css id.
'slides-buttons' and '#slide-buttons

Answer 3

Based on Cristiano Soares solution, I have also added some further suggestions.
To ensure that the main carousel component wrapper has indicators set to active;
<Carousel indicators={true} .... <Item><ProjectImg><Caption> ... >
I also added further styling, as I still couldn't see the indicators once they where enabled;
.carousel-indicators li {
background-color: red;
height: 5px;
width: 20px;
z-index: 5 !important;
margin: 0 5px;
cursor: pointer;
}
.carousel-indicators li.active {
background-color: blue;
height: 5px;
width: 20px;
z-index: 5 !important;
padding: 0 5px;
cursor: pointer;
}

Answer 4

I had the same problem with bootstrap 4. Then i figured display of indicators is none.
so this fixed my problem:
.carousel-indicators{
display: block !important;}