I want to talk about a method which I use on buttons and it should be different from others by you. With this method, you will see a little animation on the buttons when they pressed on. I recommend you to see this article if you are bored with the fixed buttons.
The buttons could be fixed when some CSS codes applied on them. For example, the CSS codes below will disable the animation of which button got applied.
.button {
background-color: #ccc;
border-width: 2px;
border-style: solid;
border-color: #eee #999 #999 #eee;
}