Stick image to side responsive bootstrap - html

Question

I am trying to create this:
I have the left and right image and the monkey image.
I was trying to create a row and make the left image col-3, the right image col-3 and the monkey and text col-6 in the middle.
Everything is stacking up on each other, comes out of the screen and not working. How can I make this sort of thing?
<section class="hero-area">
<div class="container-fluid">
<div class="row">
<div class="col-md-3 col-xs-3">
<img src="images/hero-left.svg" class="" alt="">
</div>
<div class="col-xs-6 col-md-126>
<h1 class="">
<b>monKey</b> Generator</h1>
<br>
<h2 class="">Generate a
<b>unique monkey</b> avatar
<br> from a
<b>Banano public key</b>
</h2>
<img src="https://bananomonkeys.herokuapp.com/image?address=ban_3tapge8i4kw9wa4irgda7epm4gaurr4rnp7ybjziphkt48afd6ba5pnaegs6"
class="" alt="">
</div>
<div class="col-md-3 col-sm-3">
<img src="images/hero-right.svg" class="" alt="">
</div>
</div>
</div>
</section>

Answer 1

There are couple of typos in your snippet above eg: col-md-126 and missing " after that. Also bootstrap 4 does not have xs on cols so using just col-3 col-6 col-3 would do the job.
See the snippet below.
img {
width:100%;
}
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>
<section class="hero-area">
<div class="container-fluid">
<div class="row">
<div class="col-3">
<img src="images/hero-left.svg" alt="monkey left">
</div>
<div class="col-6">
<h1>
<b>monKey</b> Generator
</h1>
<br>
<h2>Generate a
<b>unique monkey</b> avatar
<br> from a
<b>Banano public key</b>
</h2>
<img src="https://bananomonkeys.herokuapp.com/image?address=ban_3tapge8i4kw9wa4irgda7epm4gaurr4rnp7ybjziphkt48afd6ba5pnaegs6" />
</div>
<div class="col-3">
<img src="images/hero-right.svg" class="" alt="monkey right">
</div>
</div>
</div>
</section>