article ul{
    list-style-type: none;
    width: 790px;
    margin: 0 auto;
    display: flex;
}
article ul li{
    background-color: #a4ce29;
    width: 250px;
    height: 50px;
    transition-duration: .3s;
    transition-timing-function: ease;
}
article ul li::before{
    content: "";
    width: 0;
    height: 0;
}
article ul li:first-child,
article ul li:nth-child(2){
    margin-right: 20px;
}
article ul li a{
    display: block;
    width: 250px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    text-decoration: none;
    color: #000000;
}
article ul li:hover{
    background-color: #b4e12d;
}