/*effects*/
.btn-primary {
    position: relative;
    z-index: 1;
    overflow: hidden;
}
.btn-primary > span {
    display: block;
    -webkit-transition: -webkit-transform 0.3s, opacity 0.3s;
    transition: transform 0.3s, opacity 0.3s;
    -webkit-transition-timing-function: cubic-bezier(0.2, 1, 0.3, 1);
    transition-timing-function: cubic-bezier(0.2, 1, 0.3, 1);
}
.btn-primary:hover > span {
    opacity: 0;
    -webkit-transform: translate3d(0, -25%, 0);
    transform: translate3d(0, -25%, 0);
}
.btn-primary::after {
    content: attr(data-text);
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    -webkit-transform: translate3d(0, 25%, 0);
    transform: translate3d(0, 25%, 0);
    -webkit-transition: -webkit-transform 0.3s, opacity 0.3s;
    transition: transform 0.3s, opacity 0.3s;
    -webkit-transition-timing-function: cubic-bezier(0.2, 1, 0.3, 1);
    transition-timing-function: cubic-bezier(0.2, 1, 0.3, 1);
}
.btn-primary:hover::after {
    opacity: 1;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
}