.menu ul li:not(:last-child) a::after{
background: url(./images/head_3.png);
background-size: 100% 100%;
width: 0.02rem;
height: 0.4rem;
content: "";
position: absolute;
right: 0;
}
</style>
</head>
<body>
<div class='menu'>
<ul>
<li><a href="#">服务</a></li>
<li><a href="#">服务</a></li>
<li><a href="#">服务</a></li>
<li><a href="#">服务</a></li>
</ul>
</div>
background: url(./images/head_3.png);
background-size: 100% 100%;
width: 0.02rem;
height: 0.4rem;
content: "";
position: absolute;
right: 0;
}
</style>
</head>
<body>
<div class='menu'>
<ul>
<li><a href="#">服务</a></li>
<li><a href="#">服务</a></li>
<li><a href="#">服务</a></li>
<li><a href="#">服务</a></li>
</ul>
</div>