Can a dynamic class be styled using CSS? [duplicate]

Question

I have a class called .box-159 where the number changes every time the screen is refreshed. Is there a way to define this field (say background-color) in the CSS?

Answer 1

Yes it is possible just by using CSS only.

Option #1 - Match by prefix value

• Use CSS Class selector ^="class" which select all elements whose class is prefixed by "box-"

[class^="box-"] {
  background: red;
  height: 100px;
  width: 100px;
  margin: 10px 0;
  display:block
}

<div class="box-159"></div>
<span class="box-147"></span>
<article class="box-76878"></article>

Option #2 - Match by contains at least one value

• Use another CSS class selector *="class" (equivalent to CSS attribute selector) which select all elements whose class contains at least one substring "box-".

[class*="box-"] {
  background: red;
  height: 100px;
  width: 100px;
  margin: 10px 0;
  display:block
}

<div class="box-159"></div>
<span class="box-147"></span>
<article class="box-76878"></article>

Answer 2

You can add an additional class, like so, then both those elements will have the class' CSS attributes:

.box-class {
    background-color: red;
    width: 100px;
    height: 100px;
    margin-bottom: 20px;
}

<div class="box-class box-4"></div>
<div class="box-class box-159"></div>