A HTML and CSS code snippet post which shows you how to create a CSS and HTML mobile friendly responsive mosaic for images. Sourced under a permissive license. 

A CSS and HTML mobile friendly responsive mosaic for images

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<div class="image-mosaic">
<div
class="card card-tall card-wide"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
<div
class="card card-tall"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
<div
class="card"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
<div
class="card"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
<div
class="card"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
<div
class="card"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
<div
class="card card-wide"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
<div
class="card"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
<div
class="card"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
<div
class="card"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
<div
class="card"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
<div
class="card"
style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
></div>
</div>
<style>
.image-mosaic {
display: grid;
gap: 1rem;
grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
grid-auto-rows: 240px;
}
.card {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
background: #353535;
font-size: 3rem;
color: #fff;
box-shadow: rgba(3, 8, 20, 0.1) 0px 0.15rem 0.5rem, rgba(2, 8, 20, 0.1) 0px 0.075rem 0.175rem;
height: 100%;
width: 100%;
border-radius: 4px;
transition: all 500ms;
overflow: hidden;
background-size: cover;
background-position: center;
background-repeat: no-repeat;
padding: 0;
margin: 0;
}
@media screen and (min-width: 600px) {
.card-tall {
grid-row: span 2 / auto;
}
.card-wide {
grid-column: span 2 / auto;
}
}
</style>
<div class="image-mosaic"> <div class="card card-tall card-wide" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> <div class="card card-tall" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> <div class="card" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> <div class="card" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> <div class="card" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> <div class="card" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> <div class="card card-wide" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> <div class="card" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> <div class="card" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> <div class="card" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> <div class="card" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> <div class="card" style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')" ></div> </div> <style> .image-mosaic { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); grid-auto-rows: 240px; } .card { display: flex; flex-direction: column; justify-content: center; align-items: center; background: #353535; font-size: 3rem; color: #fff; box-shadow: rgba(3, 8, 20, 0.1) 0px 0.15rem 0.5rem, rgba(2, 8, 20, 0.1) 0px 0.075rem 0.175rem; height: 100%; width: 100%; border-radius: 4px; transition: all 500ms; overflow: hidden; background-size: cover; background-position: center; background-repeat: no-repeat; padding: 0; margin: 0; } @media screen and (min-width: 600px) { .card-tall { grid-row: span 2 / auto; } .card-wide { grid-column: span 2 / auto; } } </style>
<div class="image-mosaic">
  <div
    class="card card-tall card-wide"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
  <div
    class="card card-tall"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
  <div
    class="card card-wide"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://codesnippetsandtutorials.com/wp-content/uploads/2023/07/swati-b-Vf2-ZiIu8xY-unsplash-1-840x400.jpg')"
  ></div>
</div>
<style>
.image-mosaic {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  grid-auto-rows: 240px;
}

.card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: #353535;
  font-size: 3rem;
  color: #fff;
  box-shadow: rgba(3, 8, 20, 0.1) 0px 0.15rem 0.5rem, rgba(2, 8, 20, 0.1) 0px 0.075rem 0.175rem;
  height: 100%;
  width: 100%;
  border-radius: 4px;
  transition: all 500ms;
  overflow: hidden;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  padding: 0;
  margin: 0;
}

@media screen and (min-width: 600px) {
  .card-tall {
    grid-row: span 2 / auto;
  }

  .card-wide {
    grid-column: span 2 / auto;
  }
}
</style>

Tags: CSS, HTML, mobile friendly, responsive mosaic, images, image mosaic, css snippets, css code snippets, html code snippets

Image: Unsplash license 

CC BY 4.0 added intro and tags – 30 Seconds of Code