【CSS3】纯css3悬停文字线条边框动画特效

演示效果如下：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>按钮悬停动画</title>

<style>
html, body {
  color: white;
  background: #323232;
  font-weight: lighter;
}

h1, h2, h3, h4 {
  font-family: "Oswald";
}

.wrapper {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  width: vw;
  height: vh;
}
.wrapper .row {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  margin: px ;
}
.wrapper h2 {
  font-size: em;
}

.button {
  position: relative;
  cursor: pointer;
  color: white;
  font-family: "Lato";
  font-size: em;
  padding: em em em;
  margin:  px;
}
.button .inner {
  position: absolute;
  top: ;
  left: ;
  width: %;
  height: %;
}
.button:nth-of-type(1):before, .button:nth-of-type(1):after, .button:nth-of-type(1) .inner:before, .button:nth-of-type(1) .inner:after {
  background-color: #ffa726;
}
.button:nth-of-type(2):before, .button:nth-of-type(2):after, .button:nth-of-type(2) .inner:before, .button:nth-of-type(2) .inner:after {
  background-color: #26a69a;
}
.button:nth-of-type(3):before, .button:nth-of-type(3):after, .button:nth-of-type(3) .inner:before, .button:nth-of-type(3) .inner:after {
  background-color: #7e57c2;
}
.button:before, .button:after, .button .inner:before, .button .inner:after {
  position: absolute;
  content: "";
  display: block;
  -webkit-transition: -webkit-transform s;
  transition: -webkit-transform s;
  transition: transform s;
  transition: transform s, -webkit-transform s;
}
.button.horizontal:before, .button.horizontal:after, .button.both:before, .button.both:after {
  left: ;
  width: %;
  height: px;
  -webkit-transform: scaleX();
          transform: scaleX();
}
.button.horizontal .inner:before, .button.horizontal .inner:after, .button.both .inner:before, .button.both .inner:after {
  top: ;
  width: px;
  height: %;
  -webkit-transform: scaleY();
          transform: scaleY();
}
.button.horizontal .inner:before, .button.both .inner:before {
  left: ;
}
.button.horizontal .inner:after, .button.both .inner:after {
  right: ;
}
.button.horizontal .inner:hover:before, .button.horizontal .inner:hover:after, .button.both .inner:hover:before, .button.both .inner:hover:after {
  -webkit-transform: scaleY();
          transform: scaleY();
}
.button.horizontal:before, .button.both:before {
  top: ;
}
.button.horizontal:after, .button.both:after {
  bottom: ;
}
.button.horizontal:hover:before, .button.horizontal:hover:after, .button.both:hover:before, .button.both:hover:after {
  -webkit-transform: scaleX();
          transform: scaleX();
}
.button.horizontal:hover .inner:before, .button.horizontal:hover .inner:after, .button.both:hover .inner:before, .button.both:hover .inner:after {
  -webkit-transform: scaleY();
          transform: scaleY();
}
.button.horizontal.clockwise .inner:before, .button.both.clockwise .inner:before {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.horizontal.clockwise .inner:after, .button.both.clockwise .inner:after {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.horizontal.clockwise:before, .button.both.clockwise:before {
  -webkit-transform-origin: right center;
          transform-origin: right center;
}
.button.horizontal.clockwise:after, .button.both.clockwise:after {
  -webkit-transform-origin: left center;
          transform-origin: left center;
}
.button.horizontal.clockwise:hover .inner:before, .button.both.clockwise:hover .inner:before {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.horizontal.clockwise:hover .inner:after, .button.both.clockwise:hover .inner:after {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.horizontal.clockwise:hover:before, .button.both.clockwise:hover:before {
  -webkit-transform-origin: left center;
          transform-origin: left center;
}
.button.horizontal.clockwise:hover:after, .button.both.clockwise:hover:after {
  -webkit-transform-origin: right center;
          transform-origin: right center;
}
.button.horizontal.counterclockwise .inner:before, .button.both.counterclockwise .inner:before {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.horizontal.counterclockwise .inner:after, .button.both.counterclockwise .inner:after {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.horizontal.counterclockwise:before, .button.both.counterclockwise:before {
  -webkit-transform-origin: left center;
          transform-origin: left center;
}
.button.horizontal.counterclockwise:after, .button.both.counterclockwise:after {
  -webkit-transform-origin: right center;
          transform-origin: right center;
}
.button.horizontal.counterclockwise:hover .inner:before, .button.both.counterclockwise:hover .inner:before {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.horizontal.counterclockwise:hover .inner:after, .button.both.counterclockwise:hover .inner:after {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.horizontal.counterclockwise:hover:before, .button.both.counterclockwise:hover:before {
  -webkit-transform-origin: right center;
          transform-origin: right center;
}
.button.horizontal.counterclockwise:hover:after, .button.both.counterclockwise:hover:after {
  -webkit-transform-origin: left center;
          transform-origin: left center;
}
.button.vertical:before, .button.vertical:after {
  top: ;
  width: px;
  height: %;
  -webkit-transform: scaleY();
          transform: scaleY();
}
.button.vertical:before {
  left: ;
}
.button.vertical:after {
  right: ;
}
.button.vertical:hover:before, .button.vertical:hover:after {
  -webkit-transform: scaleY();
          transform: scaleY();
}
.button.vertical.clockwise:before {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.vertical.clockwise:after {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.vertical.clockwise:hover:before {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.vertical.clockwise:hover:after {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.vertical.counterclockwise:before {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}
.button.vertical.counterclockwise:after {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.vertical.counterclockwise:hover:before {
  -webkit-transform-origin: top center;
          transform-origin: top center;
}
.button.vertical.counterclockwise:hover:after {
  -webkit-transform-origin: bottom center;
          transform-origin: bottom center;
}

.codepen-link {
  position: absolute;
  bottom: px;
  right: px;
  height: px;
  width: px;
  z-index: ;
  border-radius: %;
  box-sizing: border-box;
  background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/544318/logo.jpg");
  background-position: center center;
  background-size: cover;
  opacity: ;
  -webkit-transition: all s;
  transition: all s;
}
.codepen-link:hover {
  opacity: ;
  box-shadow:   px #efefef;
}
</style>
</head>
<body>

<div class="wrapper">
  <h2>Clockwise</h2>
  <div class="row">
    <div class="button clockwise horizontal">Horizontal</div>
    <div class="button clockwise vertical">Vertical</div>
    <div class="button clockwise both">Both
      <div class="inner"></div>
    </div>
  </div>
  <h2>Counter-clockwise</h2>
  <div class="row">
    <div class="button counterclockwise horizontal">Horizontal</div>
    <div class="button counterclockwise vertical">Vertical</div>
    <div class="button counterclockwise both">Both
      <div class="inner"></div>
    </div>
  </div>
</div>

</body>
</html>
【CSS3】纯css3悬停文字线条边框动画特效

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