Answers for "hover buttons"

how to add animation to a button hover

.btn {
  background-color: #ddd;
  border: none;
  color: black;
  padding: 16px 32px;
  text-align: center;
  font-size: 16px;
  margin: 4px 2px;
  transition: 0.3s;
}

.btn:hover {
  background-color: #3e8e41;
  color: white;
}

html hover button

<button class="hoverme">hover me</button>

<style>
    
    .hoverme{
        background-color: cyan;
        border: none;
        height: 100px;
        width: 200px;
    }
    
    .hoverme:hover{
        background-color: blue;
        opacity: 0.6;
    }
    
</style>