How to make an element’s background-color a little darker using CSS

Add a dark layer on the top of it using background-image. This method keeps your text visible in the same color while changing only the background.

.button {
  display: inline-block;
  color:#fff;
  padding: 10px 20px;
  font-size: 20px;
  background-color:red;
}

.button:hover {
  background-image: linear-gradient(rgba(0, 0, 0, 0.4) 0 0);
}
<div class="button"> some text </div>
<div class="button" style="background-color:lightblue;"> some text </div>
<div class="button" style="background-color:green;"> some text </div>
<div class="button" style="background-color:grey;"> some text </div>

To have a transition:

.button {
  display: inline-block;
  color:#fff;
  padding: 10px 20px;
  font-size: 20px;
  background: linear-gradient(transparent,rgba(0, 0, 0, 0.4)) top/100% 800%;
  background-color:red;
  transition:0.5s;
}

.button:hover {
  background-position:bottom;
}
<div class="button"> some text </div>
<div class="button" style="background-color:lightblue;"> some text </div>
<div class="button" style="background-color:green;"> some text </div>
<div class="button" style="background-color:grey;"> some text </div>

Another idea with mix-blend-mode:

.button {
  display: inline-block;
  color: #fff;
  padding: 10px 20px;
  font-size: 20px;
  background-color: red;
  background-image: linear-gradient(rgba(0, 0, 0, 0.4) 0 0);
  background-blend-mode: lighten;
}

.button:hover {
  background-blend-mode: darken;
}
<div class="button"> some text </div>
<div class="button" style="background-color:lightblue;"> some text </div>
<div class="button" style="background-color:green;"> some text </div>
<div class="button" style="background-color:grey;"> some text </div>

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