.steambutton {
    display: block;
    background-color: #6f9f31;
    width: 270px;
    height: 50px;
    line-height: 50px;
    margin: auto;
    color: #fff;
    position: absolute;
    cursor: pointer;
    overflow: hidden;
    border-radius: 5px;

    &:hover {
        color: #fff;
    }

    .fa {
        display: inline-block;
        font: normal normal normal 14px/1 FontAwesome;
        font-size: inherit;
        text-rendering: auto;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        transform: translate(0, 0);
    }
}

.steambutton span {
    font-family: 'Exo 2', sans-serif;
    font-weight: bold;
    letter-spacing: 0.1em;
    width: 75%;
    font-size: 14px;
    text-transform: uppercase;
    left: 0;
    -webkit-transition: all 0.25s cubic-bezier(0.31, -0.105, 0.43, 1.4);
    transition: all 0.25s cubic-bezier(0.31, -0.105, 0.43, 1.4);
}

.steambutton span,
.steambutton .icon {
    display: block;
    height: 100%;
    text-align: center;
    position: absolute;
    top: 0;
}

.steambutton .icon .fa {
    font-size: 30px;
    line-height: 50px;
    -webkit-transition: all 0.25s cubic-bezier(0.31, -0.105, 0.43, 1.4), height 0.25s ease;
    transition: all 0.25s cubic-bezier(0.31, -0.105, 0.43, 1.4), height 0.25s ease;
}

.steambutton .icon {
    width: 25%;
    right: 0;
    -webkit-transition: all 0.25s cubic-bezier(0.31, -0.105, 0.43, 1.4);
    transition: all 0.25s cubic-bezier(0.31, -0.105, 0.43, 1.4);
}

.steambutton span,
.steambutton .icon {
    display: block;
    height: 100%;
    text-align: center;
    position: absolute;
    top: 0;
}

.steambutton span:after {
    content: '';
    background-color: #5d8628;
    width: 2px;
    height: 70%;
    position: absolute;
    top: 15%;
    right: -1px;
}

.steambutton.success span,
.steambutton:hover span {
    left: -72%;
    opacity: 0;
}

.steambutton.success .icon,
.steambutton:hover .icon {
    width: 100%;
}

.steambutton.success .icon .fa,
.steambutton:hover .icon .fa {
    font-size: 45px;
}