.btn-plug-in {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 30px;
    background-color: #000;
    color: #fff;
    text-decoration: none;
    border-radius: 30px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    border: 2px solid #000;
}

.btn-plug-in:hover {
    background-color: transparent;
    color: #000;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.btn-plug-in span {
    position: relative;
    z-index: 1;
}

.btn-plug-in:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #000, #333);
    z-index: 0;
    transition: all 0.3s ease;
}

.btn-plug-in:hover:before {
    opacity: 0;
}