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HTML

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About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <section class="buttons">
  <div class="container">
    <div >
      <img src="https://4.bp.blogspot.com/-7OHSFmygfYQ/VtLSb1xe8kI/AAAAAAAABjI/FxaRp5xW2JQ/s320/logo.png" style="width: 100px;margin-bottom:15px">
      <h1 class="heading">Button Hover Effects</h1>
    </div> 
    <a class="btnfos btnfos-1">
      <svg>
        <rect x="0" y="0" fill="none" width="100%" height="100%"/>
      </svg>
     Hover
    </a> 
    <a class="btnfos btnfos-2">Hover</a> 
    <!--End of Button 2 -->
    
    <a class="btnfos btnfos-3">Hover</a> 
    <!--End of Button 3 -->
    
    <a class="btnfos btnfos-4"><span>Hover</span></a> 
    <!--End of Button 4 -->
    
    <a class="btnfos btnfos-5">Hover</a> 
    <!--End of Button 5 -->
  </div>
  
</section>
!

CSS 

              
                
@import url(https://fonts.googleapis.com/css?family=Roboto:400,100,900);
* {
  -moz-box-sizing: inherit;
       box-sizing: inherit;
  -webkit-transition-property: all;
          transition-property: all;
  -webkit-transition-duration: .6s;
          transition-duration: .6s;
  -webkit-transition-timing-function: ease;
          transition-timing-function: ease;
}

html,
body {
  -moz-box-sizing: border-box;
       box-sizing: border-box;
  height: 100%;
  width: 100%;
}

body {
  background: #3498db;
  font-family: 'Roboto', sans-serif;
  font-weight: 400;
}

.buttons {
  display: table;
  height: 100%;
  width: 100%;
}

.container {
  display: table-cell;
  padding: 1em;
  text-align: center;
  vertical-align: middle;
}

h1.heading {
  color: #fff;
  font-size: 1.25em;
  font-weight: 900;
  margin: 0 0 0.5em;
}
@media (min-width: 450px) {
  h1.heading {
    font-size: 1.75em;
  }
}
@media (min-width: 760px) {
  h1.heading {
    font-size: 3.25em;
  }
}
@media (min-width: 900px) {
  h1.heading {
    font-size: 4.25em;
    margin: 0 0 0.5em;
  }
}
 
.btnfos {
  color: #fff;
  cursor: pointer;
  display: block;
  font-size: 16px;
  font-weight: 400;
  line-height: 45px;
  max-width: 160px;
  margin: 0 auto 2em;
  position: relative;
  text-transform: uppercase;
  vertical-align: middle;
  width: 100%;
}
@media (min-width: 400px) {
  .btnfos {
    display: inline-block;
    margin-right: 2.5em;
  }
  .btnfos:nth-of-type(even) {
    margin-right: 0;
  }
}
@media (min-width: 600px) {
  .btnfos:nth-of-type(even) {
    margin-right: 2.5em;
  }
  .btnfos:nth-of-type(5) {
    margin-right: 0;
  }
}

.btnfos-1 {
  background: #3498db;
  font-weight: 100;
}
.btnfos-1 svg {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 45px;
}
.btnfos-1 rect {
  fill: none;
  stroke: #fff;
  stroke-width: 1;
  stroke-dasharray: 422, 0;
}

.btnfos-1:hover {
  background: rgba(225, 51, 45, 0);
  letter-spacing: 1px;
  font-weight: 900;
}
.btnfos-1:hover rect {
  stroke-width: 5;
  stroke-dasharray: 15, 310;
  stroke-dashoffset: 48;
  -webkit-transition: all 1.35s cubic-bezier(0.19, 1, 0.22, 1);
          transition: all 1.35s cubic-bezier(0.19, 1, 0.22, 1);
}

.btnfos-2 {
  letter-spacing: 0;
}

.btnfos-2:hover,
.btnfos-2:active {
  letter-spacing: 5px;
}

.btnfos-2:after,
.btnfos-2:before {
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  border: 1px solid rgba(255, 255, 255, 0);
  bottom: 0px;
  content: " ";
  display: block;
  margin: 0 auto;
  position: relative;
  -webkit-transition: all 280ms ease-in-out;
          transition: all 280ms ease-in-out;
  width: 0;
}

.btnfos-2:hover:after,
.btnfos-2:hover:before {
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  border-color: #fff;
  -webkit-transition: width 350ms ease-in-out;
          transition: width 350ms ease-in-out;
  width: 70%;
}

.btnfos-2:hover:before {
  bottom: auto;
  top: 0;
  width: 70%;
}

.btnfos-3 {
  background: #3498db;
  border: 1px solid white;
  box-shadow: 0px 2px 0 white, 2px 4px 6px #eee;
  font-weight: 900;
  letter-spacing: 1px;
  -webkit-transition: all 150ms linear;
          transition: all 150ms linear;
}

.btnfos-3:hover {
  background: #3498db;
  border: 1px solid rgba(0, 0, 0, 0.05);
  box-shadow: 1px 1px 2px rgba(255, 255, 255, 0.2);
  color: #74e6e0;
  text-decoration: none;
  text-shadow: -1px -1px 0 #136a65;
  -webkit-transition: all 250ms linear;
          transition: all 250ms linear;
}

.btnfos-4 {
  border: 1px solid;
  overflow: hidden;
  position: relative;
}
.btnfos-4 span {
  z-index: 20;
}
.btnfos-4:after {
  background: #fff;
  content: "";
  height: 155px;
  left: -75px;
  opacity: .2;
  position: absolute;
  top: -50px;
  width: 50px;
  -webkit-transition: all 550ms cubic-bezier(0.19, 1, 0.22, 1);
          transition: all 550ms cubic-bezier(0.19, 1, 0.22, 1);
  -webkit-transform: rotate(35deg);
      -ms-transform: rotate(35deg);
          transform: rotate(35deg);
  z-index: -10;
}

.btnfos-4:hover:after {
  left: 120%;
  -webkit-transition: all 550ms cubic-bezier(0.19, 1, 0.22, 1);
          transition: all 550ms cubic-bezier(0.19, 1, 0.22, 1);
}

.btnfos-5 {
  border: 0 solid;
  box-shadow: inset 0 0 20px rgba(255, 255, 255, 0);
  outline: 1px solid;
  outline-color: rgba(255, 255, 255, 0);
  outline-offset: 0px;
  text-shadow: none;
  -webkit-transition: all 1250ms cubic-bezier(0.19, 1, 0.22, 1);
          transition: all 1250ms cubic-bezier(0.19, 1, 0.22, 1);
  outline-color: rgba(255, 255, 255, 0.5);
  outline-offset: 0px;
}

.btnfos-5:hover {
  border: 1px solid;
  box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.5), 0 0 20px rgba(255, 255, 255, 0.2);
  outline-offset: 15px;
  outline-color: rgba(255, 255, 255, 0);
  text-shadow: 1px 1px 2px #427388;
}
!

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