.icon-button {
    background: #161c22;
    border-radius: 3.6rem;
    cursor: pointer;
    display: inline-block;
    font-size: 2.0rem;
    height: 3.6rem;
    line-height: 3.6rem;
    margin: 0 5px;
    position: relative;
    text-align: center;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    width: 3.6rem;
}


.icon-button span {
    border-radius: 0;
    display: block;
    height: 0;
    left: 50%;
    margin: 0;
    position: absolute;
    top: 50%;

    -webkit-transition: all 0.2s;
    -moz-transition: all 0.2s;
    -o-transition: all 0.2s;
    transition: all 0.2s;

    width: 0;
}

.icon-button:hover span {
    width: 3.6rem;
    height: 3.6rem;
    border-radius: 3.6rem;
    margin: -1.8rem;
}

.twitter span {
    background-color: #4099ff;
}

.facebook span {
    background-color: #3B5998;
}

.google-plus span {
    background-color: #db5a3c;
}

.linkedin span {
    background-color: #4875B4;
}

.mail-forward span {
    background-color: black;
}


/* Icons */

.icon-button i {
    background: none;
    color: white;
    height: 3.6rem;
    left: 0;
    line-height: 3.6rem;
    position: absolute;
    top: 0;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
    width: 3.6rem;
    z-index: 10;
}

.icon-button .icon-twitter {
    color: #4099ff;
}

.icon-button .icon-facebook {
    color: #3B5998;
}

.icon-button .icon-google-plus {
    color: #db5a3c;
}

.icon-button .icon-linkedin {
    color: #4875B4;
}

.icon-button .icon-mail-forward {
    color: black;
}

.icon-button:hover .icon-twitter, .icon-button:hover .icon-facebook, .icon-button:hover .icon-google-plus, .icon-button:hover .icon-linkedin, .icon-button:hover .icon-mail-forward {
    color: white;
}

/* Underline */
a.left {
  color: #c8d1d9;;
}