CodePen Embed - CSS Button Hover Effects List

<h1 class="page_title">Button Hover Effects List</h1>

<div class="menu effect-01">
  <h3 class="menu_title">Simple Background Fade</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-02">
  <h3 class="menu_title">Shape Change</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-03">
  <h3 class="menu_title">Side Brackets</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-04">
  <h3 class="menu_title">Realistic (w/Click State)</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-05">
  <h3 class="menu_title">3D Anaglyph</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-06">
  <h3 class="menu_title">Background Shift</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-07">
  <h3 class="menu_title">Hidden Text</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-08">
  <h3 class="menu_title">Old TV</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-09">
  <h3 class="menu_title">Hidden Symbol</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-10">
  <h3 class="menu_title">Transform Shape with Border</h3>
  <ul>
    <li><a href="#" class="bdr_lft">Button</a></li>
    <li><a href="#" class="bdr_btm">Button</a></li>
    <li><a href="#" class="bdr_top">Button</a></li>
    <li><a href="#" class="bdr_rgt">Button</a></li>
  </ul>
</div>

<div class="menu effect-11">
  <h3 class="menu_title">Expanding Circle Background</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-12">
  <h3 class="menu_title">Hover Reveals Shadow</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-13">
  <h3 class="menu_title">Down &amp; Out</h3>
  <ul>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
    <li><a href="#">Button</a></li>
  </ul>
</div>

<div class="menu effect-14">
  <h3 class="menu_title">Fade Trade</h3>
  <ul>
    <li><a href="#"><span>Button</span></a></li>
    <li><a href="#"><span>Button</span></a></li>
    <li><a href="#"><span>Button</span></a></li>
    <li><a href="#"><span>Button</span></a></li>
  </ul>
</div>

/*
  NOTE:
  This pen is an ongoing collection of hover ideas. Leave me a comment if you have any suggestions!
*/

/* BASE TEMPLATE STYLES ========== */
@import url(https://fonts.googleapis.com/css?family=Raleway:300,700);
body {
  background: #fafafa;
  background-attachment: fixed;
  color: #555;
  font-family: 'Raleway', Helvetica, Arial, sans-serif;
  font-size: 18px;
  font-weight: 300;
  line-height: 140%;
  margin: 0;
  height: 100%;
  padding: 0;
  text-align: center;
  width: 100%;
}
.page_title {
  color: #0af;
  border-bottom: 1px solid rgba(0,0,0,.05);
  font-weight: 300;
  margin: 0;
  padding: 20px 0;
  text-shadow: 0 1px 1px rgba(0,0,0,.1);
  text-transform: uppercase;
}

/* PEN STYLES ========== */
.menu,
.menu .menu_title,
.menu ul li a,
.menu ul li a:after,
.menu ul li a:before {
  -webkit-transition: all 300ms ease-in-out;
  transition: all 300ms ease-in-out;
}
.menu {
  border-bottom: 1px solid rgba(0,0,0,.05);
  border-top: 1px solid #fff;
  margin: 0;
  padding: 60px 0;
}
.menu:hover {
  background: #fff;
  border-bottom: 1px solid rgba(0,0,0,.2);
}
.menu .menu_title {
  color: #ccc;
  font-size: 1.5em;
  font-weight: 300;
  margin: 0 0 20px;
}
.menu:hover .menu_title {
  color: #0af;
  text-shadow: 0 1px 1px rgba(0,0,0,.1);  
}
.menu ul {
  display: block;
  list-style: none;
  margin: 0;
  padding: 0;
}
.menu ul li {
  display: inline-block;
}
.menu ul li a {
  color: #555;
  display: block;
  line-height: 50px;
  padding: 0 30px;
  text-decoration: none;
}

/* HOVER STYLE PER CLASS ========== */

/* ----- EFFECT 01 - Simple BG Fade */
  .menu.effect-01 ul li a:hover {
    background: rgba(0,255,170,.2);
  }

/* ----- EFFECT 02 - Shape Transform */
  .menu.effect-02 ul li a:hover {
    background: rgba(136,0,68,.2);
    border-radius: 25px;
  }

/* ----- EFFECT 03 - Side Brackets */
  .menu.effect-03 ul li a {
    position: relative;
  }
  .menu.effect-03 ul li a:before {
    color: #fa0;
    content: '[';
    display: block;
    font-size: 1.5em;
    left: 30px;
    opacity: 0;
    position: absolute;
    top: 0;
  }
  .menu.effect-03 ul li a:after {
    color: #fa0;
    content: ']';
    display: block;
    font-size: 1.5em;
    opacity: 0;
    position: absolute;
    right: 30px;
    top: 0;
  }
  .menu.effect-03 ul li a:hover:before {
    left: 15px;
    opacity: 1;
  }
  .menu.effect-03 ul li a:hover:after {
    opacity: 1;
    right: 15px;
  } 
  .menu.effect-03 ul li a:hover {
    background: trasnparent;
  }

/* ----- EFFECT 04 - Realistic */
  .menu.effect-04 ul li a {
    border-radius: 5px;
    border: 1px solid rgba(0,0,0,0);
    margin: 5px 10px;
  } 
  .menu.effect-04 ul li a:hover {
    background: rgba(0,0,0,.05);
    border-bottom: 1px solid rgba(0,0,0,.2);
    border-top: 1px solid rgba(255,255,255,.5);
    box-shadow: 0 2px 2px rgba(0,0,0,.1);
    position: relative;
    text-shadow: 1px 1px 1px rgba(255,255,255,.5);
  }
  .menu.effect-04 ul li a:active {
    background: rgba(100,100,100,.05);
    border-bottom-color: rgba(0,0,0,0);
    box-shadow: 0 2px 2px rgba(0,0,0,.1) inset;
    text-shadow: none;
    top: 1px;
  }

/* ----- EFFECT 05 - 3D Anaglyph */
  .menu.effect-05 ul li a:hover {
    background: rgba(0,0,0,.4);
    box-shadow: inset 0 1px 2px rgba(0,0,0,.2);
    color: #fff;
    text-shadow: 4px 0 1px rgba(255,0,0,.5), -4px 0 1px rgba(0,0,255,.5);
  }

/* ----- EFFECT 06 - BG Shift */
  .menu.effect-06 ul li a {
    border: 1px solid rgba(0,0,0,0);
    overflow: hidden;
    position: relative;
  }
  .menu.effect-06 ul li a:after,
  .menu.effect-06 ul li a:before {
    background: rgba(0,170,0,.1);
    content: ' ';
    display: block;
    height: 100%;
    position: absolute;
    transform: skewX(-45deg);
    -webkit-transform: skewX(-45deg);
    width: 0;
    z-index: 0;
  }
  .menu.effect-06 ul li a:after {
    bottom: 0;
    right: -20%;
  }
  .menu.effect-06 ul li a:before {
    top: 0;
    left: -20%;
  }
  .menu.effect-06 ul li a:hover {
    box-shadow: inset 0 1px 2px rgba(0,0,0,.2);
  }
  .menu.effect-06 ul li a:hover:after,
  .menu.effect-06 ul li a:hover:before {
    width: 150%;
  }

/* ----- EFFECT 07 - Hidden Text */
  .menu.effect-07 ul li a {
    overflow: hidden;
    position: relative;
  }
  .menu.effect-07 ul li a:before {
    background: rgba(136,0,136,.1);
    color: rgba(0,0,0,0);
    content: 'Hello!';
    display: block;
    height: 0;
    left: 0;
    position: absolute;
    bottom: 0;
    width: 100%;
  } 
  .menu.effect-07 ul li a:hover {
    box-shadow: 0 1px 2px rgba(0,0,0,.2);
    color: rgba(0,0,0,.0);
  }
  .menu.effect-07 ul li a:hover:before {
    color: #555;
    height: 50px;
  }

/* ----- EFFECT 08 - Old TV Effect */
  .menu.effect-08 ul li a {
    border-radius: 3px;
    overflow: hidden;
    position: relative;
  }
  .menu.effect-08 ul li a:after,
  .menu.effect-08 ul li a:before {
    content: ' ';
    display: block;
    height: 0;
    position: absolute;
    width: 120%;
    z-index: 0;
  }
  .menu.effect-08 ul li a:after {
    background: rgba(250,255,250,.9);
    bottom: 50%;
    right: 0%;
    -webkit-transition: all 200ms 250ms ease-in-out;
    transition: all 200ms 250ms ease-in-out;
  }
  .menu.effect-08 ul li a:before {
    background: rgba(200,200,255,.9);
    top: 50%;
    left: 0%;
    -webkit-transition: all 200ms 125ms ease-in-out;
    transition: all 200ms 125ms ease-in-out;
  }
  .menu.effect-08 ul li a:hover {
    box-shadow: inset 0 0 80px rgba(0,0,0,.6);
    color: #fff;
    text-shadow: 0.05em .05em .05em rgba(0,0,0,.5);
  }
  .menu.effect-08 ul li a:hover:after {
    background: rgba(0,0,0,.1);
    bottom: -10%;
    height: 120%;
    position: relative;
    right: -10%;
  }
  .menu.effect-08 ul li a:hover:before {
    background: rgba(0,0,0,.1);
    height: 120%;
    left: -10%;
    position: relative;
    top: -10%;
  }

/* ----- EFFECT 09 - Hidden Symbol */
  .menu.effect-09 ul li a {
    border-top: 1px solid rgba(0,0,0,0);
    margin: 4px;
  }
  .menu.effect-09 ul li a:after {
    color: #f0a;
    content: '\00bb'; /* code for &raquo; */
    display: block;
    float: right;
    opacity: 0;
    overflow: hidden;
    width: 0;
  }
  .menu.effect-09 ul li a:hover {
    background: rgba(255,255,255,.2);
    border-radius: 3px;
    border-top: 1px solid rgba(255,255,255,.1);
    box-shadow: 0 2px 2px rgba(0,0,0,.2);
    padding-left: 20px;
    padding-right: 20px;
  }
  .menu.effect-09 ul li a:hover:after {
    opacity: 1;
    width: 20px;
  }

/* ----- EFFECT 10 - Transform Shape with Border */
  .menu.effect-10 ul li a {
    border: 1px solid rgba(0,0,0,0);
    margin: 0 10px;
  }
  .menu.effect-10 ul li a.bdr_btm {
    border-bottom: 1px solid rgba(0,170,255,.8);
  }
  .menu.effect-10 ul li a.bdr_lft {
    border-left: 1px solid rgba(0,204,68,.8);
  }
  .menu.effect-10 ul li a.bdr_rgt {
    border-right: 1px solid rgba(255,0,170,.8);
  }
  .menu.effect-10 ul li a.bdr_top {
    border-top: 1px solid rgba(170,0,255,.8);
  }
  .menu.effect-10 ul li a:hover {
    border: 1px solid rgba(0,0,0,.2);
    border-radius: 30px;
  }

/* ----- EFFECT 11 - Expanding Circle Background */
  .menu.effect-11 ul li a {
    border-radius: 3px;
    margin: 0 10px;
    overflow: hidden;
    position: relative;
  }
  .menu.effect-11 ul li a:hover {
    box-shadow: 0 2px 2px rgba(0,0,0,.2);
  }
  .menu.effect-11 ul li a:after {
    background: rgba(0,204,68,.9);
    border-radius: 50%;
    content: ' ';
    display: block;
    height: 0;
    left: 50%;
    opacity: 0;
    position: absolute;
    top: 50%;
    width: 0;
    z-index: 0;
  }
  .menu.effect-11 ul li a:hover:after {
    background: rgba(0,204,68,.1);
    height: 400px;
    left: -140px;
    opacity: 1;
    top: -180px;
    width: 400px;
  }

/* ----- EFFECT 12 - Hover Reveals Shadow */
  .menu.effect-12 ul li a {
    border-radius: 50px;
  }
  .menu.effect-12 ul li a:hover {
    box-shadow: 
      0 2px 2px rgba(0,0,0,.1),
      0 4px 4px rgba(0,0,0,.1),
      0 8px 8px rgba(0,0,0,.1),
      0 16px 16px rgba(0,0,0,.1);
  }

/* ----- EFFECT 13 - Down & Out */
  .menu.effect-13 ul li a {
    border-radius: 5px;
    box-shadow: 0 2px 2px rgba(0,0,0,.2) inset, 0 0 0 rgba(0,0,0,0);
    margin: 0 10px;
  }
  .menu.effect-13 ul li a:hover {
    box-shadow: 0 0 0 rgba(0,0,0,0) inset,
      0 2px 2px rgba(0,0,0,.1),
      0 4px 4px rgba(0,0,0,.1),
      0 8px 8px rgba(0,0,0,.1);
  }
  .menu.effect-13 ul li a:active {
    background: rgba(0,0,0,.02);
    box-shadow: 0 -2px 2px rgba(0,0,0,.1) inset, 0 0 0 rgba(0,0,0,0);
  }

/* ----- EFFECT 14 - Fade Trade */
  .menu.effect-14 ul li a {
    overflow: hidden;
    position: relative;
  }
  .menu.effect-14 ul li a span {
    filter: blur(0px);
    opacity: 1;
  }
  .menu.effect-14 ul li a:before {
    background: rgba(0,170,255,.1);
    border-radius: 5px;
    bottom: 0;
    color: #000;
    content: 'Hello!';
    display: block;
    filter: blur(5px);
    height: 50px;
    left: 0;
    opacity: 0;
    position: absolute;
    width: 100%;
  }
  .menu.effect-14 ul li a:hover span {
    filter: blur(5px);
    opacity: 0;   
  }
  .menu.effect-14 ul li a:hover:before {
    color: #555;
    filter: blur(0px);
    opacity: 1;
  }

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