Edit in JSFiddle

<section id="share">
  <ul class="share">
    <li class="share-twitter"><a href="#" target="_blank"><i class="fa fa-twitter"></i><span class="btn-text">Twitter</span></a></li>
    <li class="share-facebook"><a href="#" target="_blank"><i class="fa fa-facebook"></i><span class="btn-text">Facebook</span></a></li>
    <li class="share-google"><a href="#" target="_blank"><i class="fa fa-google-plus"></i><span class="btn-text">Google+</span></a></li>
    <li class="share-hatena"><a href="#" target="_blank"><i class="fa fa-hatena"></i><span class="btn-text">はてブ</span></a></li>
    <li class="share-pocket"><a href="#" target="_blank"><i class="fa fa-get-pocket"></i><span class="btn-text">Pocket</span></a></li>
  </ul>
</section>

body {
    margin: 10px;
    border: 2px solid #225694; 
}

#share {
    padding: 10px;
}

.share {
    overflow: hidden;
    height: 55px;
}

.share li {
    font-size: 14px;
    float: left;
    text-align: center;
    width: 19%;
    margin-right: 1%;
    border-radius: 3px;
    list-style: none;
    
    cursor: pointer;
}

.share a {
    display: block;
    height: 30px;
    padding-top: 10px;
    text-decoration: none;
    color: #fff;
}

.share i {
    margin-right: 7px;
    font-size: 1.5em;
}

.share .btn-text {
    position: relative;
    top: -3px;
}

.share .share-twitter {
    background-color: #55acee;
    box-shadow: 0 3px #2795e9;
}
.share .share-twitter:hover {
    background-color: #83c3f3;
}

.share .share-facebook {
    background-color: #3b5998;
    box-shadow: 0 3px #2d4373;
}
.share .share-facebook:hover {
    background-color: #4c70ba;
}

.share .share-google {
    background-color: #dd4b39;
    box-shadow: 0 3px #c23321;
}
.share .share-google:hover {
    background-color: #e47365;
}

.share .share-hatena {
    background-color: #2c6ebd;
    box-shadow: 0 3px #225694;
}
.share .share-hatena:hover {
    background-color: #4888d4;
}

.share .share-pocket {
    background-color: #ee4056;
    box-shadow: 0 3px #e6152f;
}
.share .share-pocket:hover {
    background-color: #f26f7f;
}

.fa-hatena:before {
    content: "B!";
    font-family: "Verdana";
    font-weight: bold;
}