如何用HTML和CSS复刻带三角右边缘的Realme文件管理器导航栏？

问题说明 #

我想要用HTML和CSS复刻Realme文件管理器中的导航栏（参考图：Realme文件管理器导航栏），已编写了如下HTML和CSS代码，但想要实现导航栏右侧的三角形状效果，请问该如何实现？同时求同类导航栏的模板。

原代码 #

CSS

.header {
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2;
  opacity: 1;
  display: flex;
  flex-direction: row;
}

.nav-bar {
  background-color: var(--nav-color );
  box-sizing: border-box;
  text-align: center;
  height: 43px;
  margin: 8px;
  overflow: hidden;
  border: 1.5px solid #000000;
}
.first {
  position: relative;
  z-index: 4;
  width: 106px;
  border-radius: 15px;
}
.second {
  width: 100px;
  position: relative;
  left: -29px;
  z-index: 3;
  border-radius: 0 15px 15px 0;
}
.third {
  width: 100px;
  position: relative;
  left: -60px;
  z-index: 2;
  border-radius: 0 15px 15px 0;
}

HTML

<!--===== HEADER =====-->
<header class="header">
  <!--===== NAV-BAR =====-->
  <a href=#home class="nav-bar first"><span class="nav-bar-title">Home</span></a>
  <a href=#about class="nav-bar second"><span class="nav-bar-title">About</span></a>
  <a href=#more class="nav-bar third"><span class="nav-bar-title">More</span></a>
</header>

实现三角效果的方法 #

可以通过CSS伪元素::after/::before绘制三角形，配合相对定位实现导航栏的三角衔接，同时优化布局避免手动偏移的问题：

修改后的完整代码 #

CSS

:root {
  --nav-color: #ffffff; /* 自定义导航栏背景色 */
}

.header {
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  padding: 0 10px;
  box-sizing: border-box;
}

.nav-bar {
  background-color: var(--nav-color);
  box-sizing: border-box;
  text-align: center;
  height: 43px;
  line-height: 43px; /* 文字垂直居中 */
  position: relative;
  border: 1.5px solid #000;
  margin-left: -12px; /* 相邻导航栏重叠，替代手动left偏移 */
}

/* 第一个导航栏：左圆角+右三角 */
.nav-bar.first {
  width: 106px;
  border-radius: 15px 0 0 15px;
  margin-left: 0;
}

.nav-bar.first::after {
  content: '';
  position: absolute;
  top: 0;
  right: -12px;
  border-top: 21.5px solid transparent;
  border-bottom: 21.5px solid transparent;
  border-left: 12px solid #000;
  z-index: 1;
}

.nav-bar.first::after {
  border-left-color: var(--nav-color);
}

/* 中间导航栏：左右三角 */
.nav-bar.second {
  width: 100px;
}

.nav-bar.second::after {
  content: '';
  position: absolute;
  top: 0;
  right: -12px;
  border-top: 21.5px solid transparent;
  border-bottom: 21.5px solid transparent;
  border-left: 12px solid #000;
  z-index: 1;
}

.nav-bar.second::before {
  content: '';
  position: absolute;
  top: 0;
  left: -12px;
  border-top: 21.5px solid transparent;
  border-bottom: 21.5px solid transparent;
  border-right: 12px solid #000;
  z-index: 1;
}

.nav-bar.second::after {
  border-left-color: var(--nav-color);
}
.nav-bar.second::before {
  border-right-color: var(--nav-color);
}

/* 最后一个导航栏：右圆角+左三角 */
.nav-bar.third {
  width: 100px;
  border-radius: 0 15px 15px 0;
}

.nav-bar.third::before {
  content: '';
  position: absolute;
  top: 0;
  left: -12px;
  border-top: 21.5px solid transparent;
  border-bottom: 21.5px solid transparent;
  border-right: 12px solid #000;
  z-index: 1;
}

.nav-bar.third::before {
  border-right-color: var(--nav-color);
}

/* 文字层级高于三角，避免被遮挡 */
.nav-bar-title {
  position: relative;
  z-index: 2;
}

HTML

<!--===== HEADER =====-->
<header class="header">
  <!--===== NAV-BAR =====-->
  <a href="#home" class="nav-bar first"><span class="nav-bar-title">Home</span></a>
  <a href="#about" class="nav-bar second"><span class="nav-bar-title">About</span></a>
  <a href="#more" class="nav-bar third"><span class="nav-bar-title">More</span></a>
</header>

关键说明 #

1. 用margin-left: -12px实现导航栏重叠，替代原代码手动left偏移的不稳定写法。
2. 伪元素绘制三角：利用透明边框+单侧有色边框生成三角形状，精准衔接导航栏边缘。
3. 单独设置伪元素的背景色和边框色，保证导航栏整体线条连贯。
4. 文字设置更高层级，避免被三角伪元素遮挡。

同类导航栏模板 #

斜切式堆叠导航 #

:root {
  --primary-bg: #f5f5f5;
  --border-color: #ddd;
}

.stack-nav {
  display: flex;
  align-items: center;
  padding: 10px;
}

.stack-nav-item {
  background: var(--primary-bg);
  border: 1px solid var(--border-color);
  padding: 8px 20px;
  position: relative;
  margin-left: -10px;
  text-decoration: none;
  color: #333;
  font-size: 14px;
}

.stack-nav-item:first-child {
  border-radius: 8px 0 0 8px;
  margin-left: 0;
}

.stack-nav-item:last-child {
  border-radius: 0 8px 8px 0;
}

.stack-nav-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -10px;
  width: 0;
  height: 0;
  border-top: 18px solid transparent;
  border-bottom: 18px solid transparent;
  border-right: 10px solid var(--primary-bg);
}

.stack-nav-item::after {
  content: '';
  position: absolute;
  top: 0;
  left: -11px;
  width: 0;
  height: 0;
  border-top: 19px solid transparent;
  border-bottom: 19px solid transparent;
  border-right: 10px solid var(--border-color);
  z-index: -1;
}

.stack-nav-item:last-child::before,
.stack-nav-item:last-child::after {
  display: none;
}

.stack-nav-item:first-child::before,
.stack-nav-item:first-child::after {
  display: none;
}

<div class="stack-nav">
  <a href="#" class="stack-nav-item">全部文件</a>
  <a href="#" class="stack-nav-item">图片</a>
  <a href="#" class="stack-nav-item">视频</a>
  <a href="#" class="stack-nav-item">文档</a>
</div>

内容的提问来源于stack exchange，提问作者Uday Shirbhate