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我是一个初学者编码，我必须创建一个学校项目的网站。我试图自己解决问题，但它不起作用。灰线我不知道它来自哪里后添加搜索栏
我想添加一个搜索栏到我的网站，所以我跟着一个教程，它在一个空白的新html页面上工作，但是当我复制粘贴到我的html页面项目时，我有这个光环框架，酒吧，它从哪里来，以及要删除/更改什么？谢谢:)
/*
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To change this template file, choose Tools | Templates
and open the template in the editor.
*/
/*
Created on : 01-mars-2017, 14:52:23
Author : jonathan
*/
/* syling my paragraphs */
div {
font-family:Times New Roman;
}
body {
font-family: Arial;
background-color: white;
}
p {
color: darkgreen;
font-size:30px;
font-family:Arial;
}
.highlight {
color:darkgray;
}
/* styling navigation */
#search {
width: 200px;
padding: 7px;
}
#submit {
padding: 7px;
background: #669999;
color: white;
margin-letf: -5px;
cursor: pointer
}
#submit:hover {
background:#333;
transition: all 0.40s;
}
.header-logo {
display:block;
height:240px;
width:240px;
background:url(images/wolf.png) no-repeat;
text-indent:50%;
white-space: nowrap;
overflow: hidden;
margin: 0 auto;
}
nav {
border-bottom:2px solid black;
border-bottom-color: #669999;
}
li{
display:inline-block;
text-align: center;
margin-right:20px;
}
nav a:link, nav a:visited {
color:gray;
font-size:15px;
text-decoration: none;
}
nav a:hover {
background-color: #99ddff;
}
nav a:active {
background-color: yellow
}
/* Bordered form */
form {
border: 3px solid #f1f1f1;
}
/* Full-width inputs */
input[type=text], input[type=password] {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
display: inline-block;
border: 1px solid #ccc;
box-sizing: border-box;
}
/* Set a style for all buttons */
button {
background-color: #4CAF50;
color: white;
padding: 14px 20px;
margin: 8px 0;
border: none;
cursor: pointer;
width: 100%;
}
/* Extra style for the cancel button (red) */
.cancelbtn {
width: auto;
padding: 10px 18px;
background-color: #f44336;
}
/* Center the avatar image inside this container */
.imgcontainer {
text-align: center;
margin: 24px 0 12px 0;
}
/* Avatar image */
img.avatar {
width: 40%;
border-radius: 50%;
}
/* Add padding to containers */
.container {
padding: 16px;
}
/* The "Forgot password" text */
span.psw {
float: right;
padding-top: 16px;
}
/* Change styles for span and cancel button on extra small screens */
@media screen and (max-width: 300px) {
span.psw {
display: block;
float: none;
}
.cancelbtn {
width: 100%;
}
}<!DOCTYPE html>
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
<head>
<title> HTML by Jo</title>
<meta charset="UTF-8">
<meta name="description" content="I by mistake deleted all the files
so i'm starting all over again">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="wolf.css">
</head>
<body>
<!-- navigation -->
<header>
<h1>
<a class="header-logo" href="http://localhost:8383/Grey%20wolf/index.html"></a>
</h1>
</header>
<nav>
<div style="text-align:center">
<ul>
<li><a href="login.html">Login</a></li>
<li><a href="about.html">ABOUT</a></li>
<li><a href="contact.html">CONTACT</a></li>
</ul></div>
<form action="https://google.com">
<input type="text" placeholder="Search..." maxlength="20" id="search">
<input type="submit" value="Go!" id="submit">
</form>
</nav>
<!-- the content -->
<div>TODO write content</div>
<p>Here is a paragraph.</p>
<p class="highlight">Another paragraph.</p>
<h3 class="highlight">this is a heading h3</h3>
<a href="https://www.codecademy.com/" target="_blank">link to codeacademy</a>
</body>
</html>
尝试使用父元素，'导航形式{ 边界：0; }' – Sravan