Three Simple CSS Animation Button Hover Effects practice

Three Simple CSS Animation Button Hover Effects practice. Developed using css and html. demo and download available.

HTML Snippet

<!-- Hover #1 -->
<div class="box-1">
  <div class="btn btn-one">
    <span>HOVER ME</span>
  </div>
</div>
 
<!-- Hover #2 -->
<div class="box-2">
  <div class="btn btn-two">
    <span>HOVER ME</span>
  </div>
</div>

<!-- Hover #3 -->
<div class="box-3">
  <div class="btn btn-three">
    <span>HOVER ME</span>
  </div>
</div>

CSS Code

@import 'https://fonts.googleapis.com/css?family=Open+Sans+Condensed:300';

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  margin: 0;
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  font-family: 'Open Sans Condensed', sans-serif;
}

div[class*=box] {
	height: 33.33%;
	width: 100%; 
  display: flex;
  justify-content: center;
  align-items: center;
}

.box-1 { background-color: #FF6766; }
.box-2 { background-color: #3C3C3C; }
.box-3 { background-color: #66A182; }

.btn {
	line-height: 50px;
	height: 50px;
	text-align: center;
	width: 250px;
	cursor: pointer;
}

/* 
========================
      BUTTON ONE
========================
*/
.btn-one {
	color: #FFF;
	transition: all 0.3s;
	position: relative;
}
.btn-one span {
	transition: all 0.3s;
}
.btn-one::before {
	content: '';
	position: absolute;
	bottom: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 1;
	opacity: 0;
	transition: all 0.3s;
	border-top-width: 1px;
	border-bottom-width: 1px;
	border-top-style: solid;
	border-bottom-style: solid;
	border-top-color: rgba(255,255,255,0.5);
	border-bottom-color: rgba(255,255,255,0.5);
	transform: scale(0.1, 1);
}
.btn-one:hover span {
	letter-spacing: 2px;
}
.btn-one:hover::before {
	opacity: 1;	
	transform: scale(1, 1);	
}
.btn-one::after {
	content: '';
	position: absolute;
	bottom: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 1;
	transition: all 0.3s;
	background-color: rgba(255,255,255,0.1);
}
.btn-one:hover::after {
	opacity: 0;	
	transform: scale(0.1, 1);
}


/* 
========================
      BUTTON TWO
========================
*/
.btn-two {
	color: #FFF;
	transition: all 0.5s;
	position: relative;	
}
.btn-two span {
	z-index: 2;	
	display: block;
	position: absolute;
	width: 100%;
	height: 100%;	
}
.btn-two::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 1;
	transition: all 0.5s;
	border: 1px solid rgba(255,255,255,0.2);
	background-color: rgba(255,255,255,0.1);
}
.btn-two::after {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 1;
	transition: all 0.5s;
	border: 1px solid rgba(255,255,255,0.2);
	background-color: rgba(255,255,255,0.1);
}
.btn-two:hover::before {
  transform: rotate(-45deg);
  background-color: rgba(255,255,255,0);
}
.btn-two:hover::after {
  transform: rotate(45deg);
  background-color: rgba(255,255,255,0);
}


/* 
========================
      BUTTON THREE
========================
*/
.btn-three {
	color: #FFF;
	transition: all 0.5s;
	position: relative;
}
.btn-three::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 1;
	background-color: rgba(255,255,255,0.1);
	transition: all 0.3s;
}
.btn-three:hover::before {
	opacity: 0 ;
	transform: scale(0.5,0.5);
}
.btn-three::after {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 1;
	opacity: 0;
	transition: all 0.3s;
	border: 1px solid rgba(255,255,255,0.5);
	transform: scale(1.2,1.2);
}
.btn-three:hover::after {
	opacity: 1;
	transform: scale(1,1);
}

Preview