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运行代码 
<!DOCTYPE html>
<html>
<head>
    <title>W3.CSS(w3cschool.cn)</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8">
    <link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
</head>
<body>
<div class="w3-container">
    <h2>无边界输入</h2>
    <p>w3-input类默认情况下具有底部边框。如果需要无边界输入，请添加w3-border-0类。</p>
</div>
<form class="w3-container w3-card-4 w3-light-grey">
    <h3>默认:</h3>
    <p>
        <label>名字</label>
        <input class="w3-input" type="text"></p>
</form>
<br>
<form class="w3-container w3-card-4 w3-light-grey">
    <h3>带边框:</h3>
    <p>
        <label>名字</label>
        <input class="w3-input w3-border" type="text"></p>
</form>
<br>
<form class="w3-container w3-card-4 w3-light-grey">
    <h3>无边距:</h3>
    <p>
        <label>名字</label>
        <input class="w3-input w3-border-0" type="text"></p>
 
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运行结果
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