如何居中简单导航栏？导航元素偏左无法与居中body对齐的问题咨询

问题原因 #

• 你当前的header使用justify-content: space-between布局时，右侧用户信息区域的.NP元素设置了position: absolute脱离了文档流，导致flex计算剩余空间时没有把这部分宽度算入，中间导航的位置参考基准错误
• .nav__links li统一设置了margin-right: 18rem，最后一个导航项后面多出来18rem的外边距，会把整体导航内容往左挤
• <ul>默认自带padding-left内边距，没有做样式重置也会导致导航整体向左偏移

具体修改方案 #

CSS修改 #

/* 可选但推荐加全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(0deg, rgba(164, 174, 228, 0.05), rgba(164, 174, 228, 0.05)), #080B1C;
    /* 给header加左右内边距避免内容贴边，数值可自行调整 */
    padding: 0 2rem;
    /* 加relative限制NP的absolute定位范围，避免它相对于整个视口定位 */
    position: relative;
}

.logohome {
    position: relative;
    width: 350px;
    display: flex;
}

/* 新增nav的样式，让它占满中间区域 */
header nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav__links a,
.overlay__content a {
    font-family: "Montserrat", sans-serif;
    font-weight: 500;
    color: #edf0f1;
    text-decoration: none;
}

.nav__links {
    list-style: none;
    display: flex;
    align-items: center;
    /* 用gap替代li的margin-right，不会给最后一个元素加多余边距 */
    gap: 18rem;
}

/* 删掉原来的 .nav__links li { margin-right: 18rem; } 这段代码 */

.nav__links li a {
    transition: color 0.3s ease 0s;
}

.nav__links li a:hover {
    color: #A4AEE4;
}

.NP {
    position: absolute;
    margin-right: 4.6rem;
    right: 0;
    color: #24252a;
    font-family: "Montserrat";
    font-weight: 700;
    font-style: normal;
    font-size: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
}

.profile {
    border-radius: 50%;
    margin-right: 4rem;
    width: 50px;
    transition: background-color 0.3s ease 0s;
    z-index: 0;
}

.dropbtn {
    position: absolute;
    margin-left: 4.5rem;
    bottom: 2px;
    width: 25px;
    background-color: transparent;
    color: white;
    font-size: 16px;
    border: none;
    cursor: pointer;
}

HTML微小调整 #

<header>
    <img href="google.com" class="logohome" src="images/logo.png">

    <nav>
        <ul class="nav__links">
            <li><a href="/favoris.html">Mes Favoris </a></li>
            <li><a href="#">Accueil</a></li>
            <li><a href="/stats.html">Mes Statistiques</a></li>
            <img src="/images/navstate.png" class="navstate">
        </ul>
    </nav>
    <a class="cta" href="#"></a>

    <img src="/images/iconeprofile.png" class="profile">
    <div class="NP">NP
        <div class="dropdown">
        </div>
        <img src="/images/drop.png" onclick="myFunction()" class="dropbtn">
        <div id="myDropdown" class="dropdown-content">
            <a href="#">Mon profil</a>
            <a href="#">Nous contacter</a>
            <a href="#">Déconnexion</a>
        </div>
    </div>
</header>

注：删掉了logo后面多余的<br><br>标签，避免影响header垂直布局。

内容的提问来源于stack exchange，提问作者Trick Shot