MediaWiki:Common.css

/* CSS placed here will be applied to all skins */
<style>
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@600;700&display=swap');

body { 
font-family: 'Montserrat', sans-serif;
}

#content body {
max-width: 70ch;
}

#content a {
  font-weight: bold;
}

#content h1,
#content h2,
#content h3,
#content h4 { 
font-family: 'Montserrat', sans-serif;
}

h1,
h2 {
font-weight: bold;
}

 /* Tooltip container */
.tooltip {
  position: relative;
  display: inline-block;
  border-bottom: 1px dotted black; /* If you want dots under the hoverable text */
}

/* Tooltip text */
.tooltip .tooltiptext {
  visibility: hidden;
  width: 120px;
  background-color: #555;
  color: #fff;
  text-align: center;
  padding: 5px 0;
  border-radius: 6px;

  /* Position the tooltip text */
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  margin-left: -60px;

  /* Fade in tooltip */
  opacity: 0;
  transition: opacity 0.3s;
}

/* Tooltip arrow */
.tooltip .tooltiptext::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: #555 transparent transparent transparent;
}

/* Show the tooltip text when you mouse over the tooltip container */
.tooltip:hover .tooltiptext {
  visibility: visible;
  opacity: 1;
} 
</style>