.slide-btn{
    position: relative;
    display: inline-block;
    padding: 8px 20px;
    color: #000;
    border: 2px solid #03cc85;
    text-decoration: none;
    font-weight: 600;
    overflow: hidden;
    transition: color 0.4s ease;
}

.slide-btn::before{
    content:"";
    position:absolute;
    top:0;
    left:-100%;
    width:100%;
    height:100%;
    background:#03cc85;
    transition: all 0.4s ease;
    z-index:-1;
}

.slide-btn:hover{
    color:#03bb7a;
}

.slide-btn:hover::before{
    left:0;
}