.demo{ background:#e8e8e8; }

.btn{
    color: #fff;
    font-family: "Outfit", sans-serif;
    font-size: 22px;
    font-weight: 700;
    text-transform: capitalize;
    letter-spacing: 1px;
    padding: 6px 14px;
    border-radius: 8px 8px;
    position: relative;
    margin: 0 10px;
    transition: all 0.3s;
    z-index: 1;
} 

.btn:hover{ color: #fff; }

.btn:before,
.btn:after{
    content: '';
    background: linear-gradient(-45deg,#e81cff 0%,#40c9ff 100% );
    width: calc(100% + 15px);
    height: calc(100% + 15px);
    border-radius: 14px;
    transform: translateX(-50%) translateY(-50%);
    position: absolute;
    top: 50%;
    left: 50%;
    transition: all 0.3s ease-in-out;
    z-index: -1;
}

.btn:after{
    background: #000;
    width: 100%;
    height: 100%;
    border-radius: 10px;
}

.btn:hover:before{ transform: translateX(-50%) translateY(-50%) rotate(-180deg); }

@media only screen and (max-width: 767px){
    .btn{ margin-bottom: 30px; }
}