Check out example codes for "nice button css". It will help you in understanding the concepts better.

Code Example 1

/* ADD FONT WITH SHADOW AND INCLUDE A LINEAR GRADIENT TO MAKE THE BUTTON
* MORE ATTRACTIVE IN WORDPRESS */
/* CONTACT US FORM HOME PAGE */
.button {
	color: #fff;
	text-shadow: 2px 2px 2px rgba(0, 0, 0, 1);
	border-radius: 5px;
	font-family: "Montserrat";
	font-weight: 500;
	padding-top: 1%;
	padding-bottom: 1%;
	background-color: #a28f9d;	
	background-image: -webkit-gradient(linear, 0% 0%, 0% 100%, from(rgba(255, 255, 255, 0.6)), color-stop(0.49, rgba(255, 255, 255, 0.3)), color-stop(0.51, rgba(255, 255, 255, 0.0)), to(rgba(255, 255, 255, 0.2))); /* Chrome,Safari4+ */
    background-image: -webkit-linear-gradient(top, rgba(255, 255, 255, 0.6) 0%, rgba(255, 255, 255, 0.3) 50%, rgba(255, 255, 255, 0.0) 51%, rgba(255, 255, 255, 0.2) 100%); /* Chrome10+,Safari5.1+ */
    background-image: -moz-linear-gradient(top, rgba(255, 255, 255, 0.6) 0%, rgba(255, 255, 255, 0.3) 50%, rgba(255, 255, 255, 0.0) 51%, rgba(255, 255, 255, 0.2) 100%); /* FF3.6+ */
    background-image: -o-linear-gradient(top, rgba(255, 255, 255, 0.6) 0%, rgba(255, 255, 255, 0.3) 50%, rgba(255, 255, 255, 0.0) 51%, rgba(255, 255, 255, 0.2) 100%); /* Opera11.10+ */
    background-image: linear-gradient(top, rgba(255, 255, 255, 0.6) 0%, rgba(255, 255, 255, 0.3) 50%, rgba(255, 255, 255, 0.0) 51%, rgba(255, 255, 255, 0.2) 100%); /* W3C */	
}

.button:hover {
	background-color: #84a98c;	
}

Code Example 2

/* Answer to: "nice button css" */

/*
  You find find 6 Simple Nice looking buttons here:
  https://www.fabriziovanmarciano.com/button-styles/

  However, if you don't want them you can check out 52 beautiful
  buttons here:
  https://freshdesignweb.com/css3-buttons/

  Those aren't good enough? Well... you have to be able to find a
  nice looking button here, over 120 buttons waiting to be used
  for free over here:
  https://freefrontend.com/css-buttons/

  None of them fits you website style?? Okay, your best option is
  to make your one! Learn how to make your own using the tutorial
  made by W3Schools, here's a link:
  https://www.w3schools.com/css/css3_buttons.asp
*/

Code Example 3

/* Answer to: "button hover css" */

/*
  Use the :hover selector to change the style of a button when you
  move the mouse over it.
*/

.button {
  background-color: #f44336;
  border: none;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  transition-duration: 0.4s;
}

.button:hover {
  background-color: #4CAF50; /* Green */
  color: white;
}

Code Example 4

<button type="button">Click Me!</button>

Code Example 5

<a href="#" class="myButton">green</a>

.myButton {
	background-color:#44c767;
	border-radius:28px;
	border:1px solid #18ab29;
	display:inline-block;
	cursor:pointer;
	color:#ffffff;
	font-family:Arial;
	font-size:17px;
	padding:16px 31px;
	text-decoration:none;
	text-shadow:0px 1px 0px #2f6627;
}
.myButton:hover {
	background-color:#5cbf2a;
}
.myButton:active {
	position:relative;
	top:1px;
}

Code Example 6

<div class="placeholder-box">
  <button type="button"> Button Text Here </button>
  <p>Nunc condimentum mauris elit</p>
  <ul>
    <li>Duis quis eros felis</li>
    <li>Nulla facilisi</li>
  </ul>
</div>

Learn ReactJs, React Native from akashmittal.com