p.caption {
  color: #777;
  margin-top: 10px;
}
p code {
  white-space: inherit;
}

pre {
  word-break: normal;
  word-wrap: normal;
}
pre code {
  white-space: inherit;
}

 
.embed-container { 
 position: relative; 
 padding-bottom: 56.25%; 
 height: 0; 
 overflow: hidden; 
 max-width: 100%; 
 height: auto;
 margin-top: 30px;
 margin-bottom: 30px; 
} 
.embed-container iframe, .embed-container object, .embed-container embed {
 position: absolute; 
 top: 0; 
 left: 0; 
 width: 100%; 
 height: 100%; 
}

<style>
/* 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: 240px;
  background-color: black;
  color: #fff;
  text-align: center;
  padding: 5px 0;
  border-radius: 6px;
 
  /* Position the tooltip text - see examples below! */
  position: absolute;
  z-index: 1;
}

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