.btn{
    color: #555;
    background: transparent;
    font-family: 'Oswald', sans-serif;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 7px 20px;
    margin: 7px;
    border: none;
    border-radius: 0;
    position: relative;
    z-index: 1;
    transition:all 0.5s ease 0s;
}
.btn:focus,
.btn:hover{
    color: #fff;
    background: #bc01ad;
}
.btn:before,
.btn:after{
    content: '';
    border-left:2px solid #555; border-top:2px solid #555; height: 100%;
    width: 80%;
    border-right: medium none;
    border-bottom: medium none;
    position: absolute;
    left: -7px;
    top: -7px;
    transition: all 0.2s ease-in, width 0.5s cubic-bezier(.45,-0.33,.43,1.46)
}
.btn:after{
    transform: rotate(180deg);
    top: auto;
    left: auto;
    right: -7px;
    bottom: -7px;
}
.btn:hover:before,
.btn:hover:after{
    width: 30%;
}
@media only screen and (max-width: 767px){
    .btn{ margin-bottom: 30px; }