nav a {
    position: relative;
    display: inline-block;
    margin: 15px 25px;
    outline: none;
    color: white;
    text-decoration: none;
    letter-spacing: 1px;
    font-weight: 400;
}

.hoverEffect  {
    position: relative;
    z-index: 1;
}

.hoverEffect a {
    overflow: hidden;
    margin: 0 15px;
}

.hoverEffect a span {
    display: block;
    padding: 10px 20px;
    background: black;
    -webkit-transition: -webkit-transform 0.3s;
    -moz-transition: -moz-transform 0.3s;
    transition: transform 0.3s;
}

.hoverEffect a::before {
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    padding: 10px ;
    width: 100%;
    height: 100%;
    background: white;
    color: black;
    content: attr(data-hover);
    text-align: center;
    -webkit-transition: -webkit-transform 0.3s;
    -moz-transition: -moz-transform 0.3s;
    transition: transform 0.3s;
    -webkit-transform: translateX(-25%);
}

.hoverEffect a:hover span,
.hoverEffect a:focus span,
.hoverEffect a:active span{
    -webkit-transform: translateX(100%);
    -moz-transform: translateX(100%);
    transform: translateX(100%);
}

.hoverEffect a:hover::before,
.hoverEffect a:focus::before,
.hoverEffect a:active::before{
    -webkit-transform: translateX(0%);
    -moz-transform: translateX(0%);
    transform: translateX(0%);
}