Bootstrap Carousel - Blurred Static Text Box - html

Question

I am using the Bootstrap carousel, and I would like to add text that stays statically when you resize the window, and for mobile devices/tablets. I tried adding a H1 element, but it did not work correctly (moves about when resizing).
I have attached an image of how I would like it to look, with a blurred background so you can see the text as some images are of phones, and routers etc.
how I would like it to look
This is the code currently: (not sure if you need to see the CSS, or the java)
Please could someone assist me, pretty new to web development.
.carousel-item {
height: 70vh;
min-height: 350px;
background: no-repeat center center scroll;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
.carousel-caption {
width: 28em;
z-index: 10;
color: #fff;
text-align: center;
top: 50%;
left: 65%;
bottom: auto;
-webkit-transform: translate(0, -50%);
-ms-transform: translate(0, -50%);
transform: translate(0, -50%);
}
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<header>
<div id="carouselIndicators" class="carousel slide" data-ride="carousel">
<ol class="carousel-indicators">
<li data-target="#carouselIndicators" data-slide-to="0" class="active"></li>
<li data-target="#carouselIndicators" data-slide-to="1"></li>
<li data-target="#carouselIndicators" data-slide-to="2"></li>
<li data-target="#carouselIndicators" data-slide-to="3"></li>
<li data-target="#carouselIndicators" data-slide-to="4"></li>
<li data-target="#carouselIndicators" data-slide-to="5"></li>
<li data-target="#carouselIndicators" data-slide-to="6"></li>
</ol>
<div class="carousel-inner" role="listbox">
<div class="carousel-item active" style="background-image: url('phone.jpeg')">
<div class="carousel-caption d-none d-md-block">
<h2 class="display-4"></h2>
<p class="lead"></p>
</div>
</div>
<div class="carousel-item" style="background-image: url('telecommunications.jpeg')">
<div class="carousel-caption d-none d-md-block">
<h2 class="display-4"></h2>
<p class="lead"></p>
</div>
</div>
<div class="carousel-item" style="background-image: url('fibre.jpeg')">
<div class="carousel-caption d-none d-md-block">
<h2 class="display-4"></h2>
<p class="lead"></p>
</div>
</div>
<div class="carousel-item" style="background-image: url('support.jpeg')">
<div class="carousel-caption d-none d-md-block">
<h2 class="display-4"></h2>
<p class="lead"></p>
</div>
</div>
<div class="carousel-item" style="background-image: url('wire.jpeg')">
<div class="carousel-caption d-none d-md-block">
<h2 class="display-4"></h2>
<p class="lead"></p>
</div>
</div>
<div class="carousel-item" style="background-image: url('5g.jpeg')">
<div class="carousel-caption d-none d-md-block">
<h2 class="display-4"></h2>
<p class="lead"></p>
</div>
</div>
<div class="carousel-item" style="background-image: url('internet.jpeg')">
<div class="carousel-caption d-none d-md-block">
<h2 class="display-4"></h2>
<p class="lead"></p>
</div>
</div>
</div>
<a class="carousel-control-prev" href="#carouselIndicators" 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="#carouselIndicators" role="button" data-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>
</header>