.animate, .btn, .btn-border-o:before, .btn-border-o:after, .btn-border:before, .btn-border:after, .btn-border-rev-o:before, .btn-border-rev-o:after, .btn-border-rev:before, .btn-border-rev:after, .btn-fill-vert-o:before, .btn-fill-vert-o:after, .btn-fill-vert:before, .btn-fill-vert:after, .btn-fill-horz-o:before, .btn-fill-horz-o:after, .btn-fill-horz:before, .btn-fill-horz:after {
    -webkit-transition: all 0.3s;
    transition: all 0.3s;
}


.btn {
    display: inline-block;
    line-height: 35px;
    margin: 8px;
    padding: 0 15px;
    font-size: 15px;
    position: relative;
    opacity: .999;
    border-radius: 3px;
}

.btn-border-o {
    background-color: transparent;
    border: 1px solid #222222;
    color: #222222;
}
.btn-border-o:before, .btn-border-o:after {
    content: '';
    border-style: solid;
    position: absolute;
    z-index: 5;
    border-radius: 3px;
    box-sizing: content-box;
}
.btn-border-o:before {
    width: 0;
    height: 100%;
    border-width: 1px 0 1px 0;
    top: -1px;
    left: 0;
    -webkit-transition-delay: 0.05s;
    transition-delay: 0.05s;
}
.btn-border-o:after {
    width: 100%;
    height: 0;
    border-width: 0 1px 0 1px;
    top: 0;
    left: -1px;
}
.btn-border-o:hover:before {
    width: 100%;
}
.btn-border-o:hover:after {
    height: 100%;
}
.btn-border-o.btn-green:before, .btn-border-o.btn-green:after {
    border-color: #00dfb9;
}
.btn-border-o.btn-green:hover {
    color: #00dfb9;
}