css give transition to a property code example

Example 1: css transition

<style>
div {
  background-color: blue;
  padding: 40px;
  color: white;
  cursor: pointer;
  -webkit-transition: all 0.5s 0s ease;
  -moz-transition: all 0.5s 0s ease;
  -o-transition: all 0.5s 0s ease;
  transition: all 0.5s 0s ease;
}
/*transition: property duration timing-function delay|initial|inherit;*/

.hidden {
  visibility: visible;
  opacity: 0.1;
  max-width: 12%;
}

.hidden:hover {
  visibility: visible;
  opacity: 1;
	max-width: 100%;
}
</style>

<div class="hidden">HOVER ME!</div>

Example 2: html transition

html.color-theme-in-transition,
html.color-theme-in-transition *,
html.color-theme-in-transition *:before,
html.color-theme-in-transition *:after {
	transition: all 750ms !important;  
    transition-delay: 0 !important;
}