Untitled

<!DOCTYPE html>
<html>
<head>
<style>

.remove {
  background-color: #f44336;
  color: white;
  border: 2px solid #f44336;
  padding: 4px 8px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 12px;
  margin: 4px 2px;
  -webkit-transition-duration: 0.4s; /* Safari */
  transition-duration: 0.4s;
  cursor: pointer;
}

.remove:hover {
  background-color: white;
  color: black;
}

</style>
</head>
<body>

<button class="remove">X</button>

</body>
</html>