<div class="container">
  <a class="btn btn1" href="#"><span>hover me!</span></a>
</div>
@import url('https://fonts.googleapis.com/css?family=Roboto+Condensed:700');
* {
  box-sizing: border-box;
  margin:0;
  padding:0;
}
html,body {
  width:100%;
  height:100%;
  font-family: 'Roboto Condensed', sans-serif;
  letter-spacing : 2px;
  background-color:#000;
}
a {
  margin-bottom: 30px;
}
p {
  font-size: 13px;
  font-weight: bold;
  margin-bottom: 7px;
  color: #444;
}
.container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  min-height: 100%;
  margin: 0 auto;
  padding: 50px;
}
/* button style from here */
// button Common
.btn {
  position: relative;
  display: inline-block;
  width: 150px;
  line-height: 3;
  text-align: center;
  text-decoration: none;
  color: #21ebff;
  font-size: 0.95rem;
  font-weight: bold;
  background: #000;
  
  transition: all 0.3s;
  cursor: pointer;
  user-select: none;
}
.btn:hover {
  color: #fff;
  letter-spacing: 2px;
  box-shadow: none;
  transform: translateY(5px);
  box-shadow: 0 0 5px #21ebff, inset 0 0 10px #0bf4f3, 0 0 20px #21ebff inset, 0 0 20px #21ebff inset;
}
/* btn1 */
// button line neutral
// common
$lineWidth : 2px;
%btnLine1 {
  content: '';
  position: absolute;
  transition: all 0.1s;
  background-color: #21ebff;
}
//each
.btn1::before {
  @extend %btnLine1;
  height: $lineWidth;
  width: 0;
  top: 0;
  left: 0;
  transition-delay: 0.4s;
}
.btn1::after {
  @extend %btnLine1;
  width: $lineWidth;
  height: 0;
  top: 0;
  right: 0;
  transition-delay: 0.3s;
}
.btn1 span::before {
  @extend %btnLine1;
  height: $lineWidth;
  width: 0;
  bottom: 0;
  right: 0;
  transition-delay: 0.2s;
}
.btn1 span::after {
  @extend %btnLine1;
  width: $lineWidth;
  height: 0;
  bottom: 0;
  left: 0;
  transition-delay: 0.1s;
}
// button line hovered
// common
%btnLine1HoverW {
  width: 100%;
  transition: all 0.1s;
}
%btnLine1HoverH {
  height: 100%;
  transition: all 0.1s;
}
// each
.btn1:hover::before {
  @extend %btnLine1HoverW;
}
.btn1:hover::after {
  @extend %btnLine1HoverH;
  transition-delay: 0.1s;
}
.btn1:hover span::before {
  @extend %btnLine1HoverW;
  transition-delay: 0.2s;
}
.btn1:hover span::after {
  @extend %btnLine1HoverH;
  transition-delay: 0.3s;
}
.btn1:hover {
  transition-delay: 0.4s;
}
/* btn2 */
// button line neutral
// common
%btnLine2 {
  content: '';
  position: absolute;
  transition: all 0.2s;
  background-color: #555;
}
//each
.btn2::before {
  @extend %btnLine2;
  height: $lineWidth;
  width: 0;
  top: 0;
  left: 0;
  transition-delay: 0.4s;
}
.btn2::after {
  @extend %btnLine2;
  width: $lineWidth;
  height: 0;
  top: 0;
  right: 0;
  transition-delay: 0.2s;
}
.btn2 span::before {
  @extend %btnLine2;
  height: $lineWidth;
  width: 0;
  bottom: 0;
  right: 0;
  transition-delay: 0.4s;
}
.btn2 span::after {
  @extend %btnLine2;
  width: $lineWidth;
  height: 0;
  bottom: 0;
  left: 0;
  transition-delay: 0.2s;
}
// button line hovered
// common
%btnLine2HoverW {
  width: 100%;
  transition: all 0.2s;
}
%btnLine2HoverH {
  height: 100%;
  transition: all 0.2s;
}
// each
.btn2:hover::before {
  @extend %btnLine2HoverW;
}
.btn2:hover::after {
  @extend %btnLine2HoverH;
  transition-delay: 0.2s;
}
.btn2:hover span::before {
  @extend %btnLine2HoverW;
}
.btn2:hover span::after {
  @extend %btnLine2HoverH;
  transition-delay: 0.2s;
}
.btn2:hover {
  transition-delay: 0.4s;
}

/* btn3 */
// button line neutral
// common
$lineDist: -0.4em;
%btnLine3 {
  content: '';
  position: absolute;
  transition: all 0.2s;
  background-color: #555;
}
//each
.btn3::before {
  @extend %btnLine3;
  height: $lineWidth;
  width: 0;
  top: 0;
  left: 0;
  transition-delay: 0.2s;
}
.btn3::after {
  @extend %btnLine3;
  width: $lineWidth;
  height: 0;
  bottom: 0;
  right: 0;
  transition-delay: 0.2s;
}
.btn3 span::before {
  @extend %btnLine3;
  height: $lineWidth;
  width: 0;
  bottom: 0;
  right: 0;
  transition-delay: 0.2s;
}
.btn3 span::after {
  @extend %btnLine3;
  width: $lineWidth;
  height: 0;
  top: 0;
  left: 0;
  transition-delay: 0.2s;
}
// button line hovered
// common
%btnLine3HoverW {
  width: 0.7em;
  transition: all 0.2s;
}
%btnLine3HoverH {
  height: 0.7em;
  transition: all 0.2s;
}
%LT {
  top: $lineDist;
  left: $lineDist;
}
%RB {
  bottom: $lineDist;
  right: $lineDist;
}
// each
.btn3:hover::before {
  @extend %btnLine3HoverW;
  @extend %LT;
}
.btn3:hover::after {
  @extend %btnLine3HoverH;
  @extend %RB;
  transition-delay: 0.2s;
}
.btn3:hover span::before {
  @extend %btnLine3HoverW;
  transition-delay: 0.2s;
  @extend %RB;
}
.btn3:hover span::after {
  @extend %btnLine3HoverH;
  @extend %LT;
}
.btn3:hover {
  transition-delay: 0.4s;
}
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