Display images horizontally (List layout)

Add this code to the Custom CSS field on the Style tab of your Before and After Slider widget’s settings:

[class^="LayoutList__Container-sc"] {
  display: flex;
}

[class^='LayoutList__Item-sc']:not(:last-child) {
  margin-right: 20px;
}

[class^='Widget__Container-sc'] {
  overflow: auto;
}