MediaWiki:Common.css

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/* Spoiler box: force wrapping inside collapsibles */
.mw-collapsible .mw-collapsible-content,
.spoiler-body {
  white-space: normal !important;   /* override the nowrap */
  display: block;
  overflow-wrap: anywhere;          /* wrap long words/URLs */
  word-break: normal;
}
 
/* Make sure the container behaves like a normal block */
.spoiler-box { 
  display: block;
  max-width: 100%;
  box-sizing: border-box;
}