how do i create a photo collage with html css and bootstrap - html

Question

I tried adding images to the div it did't work for me,
<img
class="img-fluid"
src="https://via.placeholder.com/800x800"
style="border-radius: 20px"
/>
Therefore I tried adding background images to divs, and when i add images to the divs the images wont show?can anyone tell me a solution to this and why this is hapenning?
<div class="col-lg-6">
<!-- ??????? how do i create the grid -->
<div class="row g-0">
<div class="col-lg-4">
<div
class="imgcollage"
style="background-image: url(../img/img2.jpg)"
></div>
</div>
<div class="col-lg-8">
<div
class="imgcollage"
style="background-image: url(../img/img2.jpg)"
></div>
</div>
</div>
<div class="row g-0">
<div class="col-lg-8">
<div
class="imgcollage"
style="background-image: url(../img/img2.jpg)"
></div>
</div>
<div class="col-lg-4">
<div
class="imgcollage"
style="background-image: url(../img/img3.jpg)"
></div>
</div>
</div>
</div>
here's the css
.imgcollage {
height: 100%;
width: 100%;
background-position: center;
background-size: cover;
border-radius: 20px;
}

Answer 1

sorry i'm posting another answer with working pictures the other pics didn't work because they aren't actually urls
.imgcollage {
height: 100%;
width: 100%;
background-position: center;
background-size: cover;
border-radius: 20px;
}
.col-lg-6{
display:grid;
/* declares how many columns there will automaticaly be and how big they will be +rows and how big of a gap between them*/
grid-template-columns: 250px 250px;
grid-template-rows: 250px 250px;
grid-gap: 15px;
<div class="col-lg-6">
<!-- ??????? how do i create the grid -->
<div
class="imgcollage"
style="background-image: url(https://images.pexels.com/photos/2253275/pexels-photo-2253275.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500)"
></div>
<div
class="imgcollage"
style="background-image: url(https://images.pexels.com/photos/1108099/pexels-photo-1108099.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500)"
></div>
<div
class="imgcollage"
style="background-image: url(https://images.pexels.com/photos/731022/pexels-photo-731022.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500)"
></div>
<div
class="imgcollage"
style="background-image: url(https://images.pexels.com/photos/2623968/pexels-photo-2623968.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500)"
></div>
</div>