Answers for "how to style checked radio btn"

radio checked css

/* Radio element, when checked */
input[type="radio"]:checked {
  box-shadow: 0 0 0 3px orange;
}

css change radio button style

.radiobutton{
	background-color: cyan;
  	border: none;
  	padding: 2px;
}

.radiobutton:hover{
	background-color: blue;
  	border: none;
  	padding: 10px;
}