Bootstrap容器内Row无法居中求助（最后一行未居中）

尝试使用<div class="row justify-content-center">实现容器内Row的居中效果，但最后一行元素始终无法居中，怀疑是现有CSS样式冲突导致，且无法添加模板中原本不存在的.portfolio类。

问题截图 #

当前代码片段 #

CSS代码 #

.portfolio #portfolio-flters {
  padding: 0;
  width: 50%;
  margin: auto;
  list-style: center;
  text-align: center;
  border-radius: 50px;
}

.portfolio #portfolio-flters li {
  cursor: pointer;
  display: inline-block;
  padding: 10px 15px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  text-transform: uppercase;
  color: #444444;
  width: 50%;
  margin: auto;
  margin-bottom: 5px;
  transition: all 0.3s ease-in-out;
  font-family: "Poppins", sans-serif;
}

.portfolio #portfolio-flters li:hover,
.portfolio #portfolio-flters li.filter-active {
  color: #593d4a;
}

.portfolio #portfolio-flters li:last-child {
  margin-right: 0;
}

.portfolio .portfolio-item {
  margin-bottom: 30px;
}

.portfolio .portfolio-item .portfolio-info {
  opacity: 0;
  position: absolute;
  left: 30px;
  right: 30px;
  margin: auto;
  width: 20%;
  text-align: center;
  bottom: 0;
  z-index: 3;
  transition: all ease-in-out 0.3s;
  background: rgba(255, 255, 255, 0.9);
  padding: 15px;
}

.portfolio .portfolio-item .portfolio-info h4 {
  font-size: 12px;
  color: #fff;
  font-weight: 600;
  color: #191919;
}

.portfolio .portfolio-item .portfolio-info p {
  color: #4c4c4c;
  font-size: 14px;
  margin-bottom: 0;
}

.portfolio .portfolio-item .portfolio-info .preview-link,
.portfolio .portfolio-item .portfolio-info .details-link {
  position: absolute;
  right: 40px;
  font-size: 24px;
  top: calc(50% - 18px);
  color: #333333;
}

.portfolio .portfolio-item .portfolio-info .preview-link:hover,
.portfolio .portfolio-item .portfolio-info .details-link:hover {
  color: #593d4a;
}

.portfolio .portfolio-item .portfolio-info .details-link {
  right: 10px;
}

.portfolio .portfolio-item .portfolio-links {
  opacity: 0;
  left: 0;
  right: 0;
  text-align: center;
  z-index: 3;
  position: absolute;
  transition: all ease-in-out 0.3s;
}

.portfolio .portfolio-item .portfolio-links a {
  color: #fff;
  margin: 0 2px;
  font-size: 28px;
  display: inline-block;
  transition: 0.3s;
}

.portfolio .portfolio-item .portfolio-links a:hover {
  color: #593d4a;
}

.portfolio .portfolio-item:hover .portfolio-info {
  opacity: 1;
  bottom: 20px;
}

HTML代码 #

<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css">
<section id="dataviz/wordclouds" class="portfolio">
  <p></p>
  <div class="container">
    <h3>Word Clouds</h3>

    <div class="portfolio-container" data-aos="fade-up" data-aos-delay="150">
      <div class="row justify-content-center">
        <div class="col-lg-4 portfolio-item filter-wc">
          <img src="https://via.placeholder.com/300x100" class="img-fluid" alt="">
          <div class="portfolio-info">
            <h4>20 Nov</h4>
          </div>
        </div>

        <div class="col-lg-4 portfolio-item filter-wc">
          <img src="https://via.placeholder.com/300x100" class="img-fluid" alt="">
          <div class="portfolio-info">
            <h4>21 Nov</h4>
          </div>
        </div>

        <div class="col-lg-4 portfolio-item" filter-wc>
          <img src="https://via.placeholder.com/300x100" class="img-fluid" alt="">
          <div class="portfolio-info">
            <h4>22 Nov</h4>
          </div>
        </div>

        <div class="col-lg-4 portfolio-item filter-wc">
          <img src="https://via.placeholder.com/300x100" class="img-fluid" alt="">
          <div class="portfolio-info">
            <h4>23 Nov</h4>
          </div>
        </div>

        <div class="col-lg-4 portfolio-item filter-wc">
          <img src="https://via.placeholder.com/300x100" class="img-fluid" alt="">
          <div class="portfolio-info">
            <h4>24 Nov</h4>
          </div>
        </div>
      </div>
    </div>
</section>

解决方案 #

1. 修复HTML语法错误 #

第三个portfolio-item的filter-wc未添加class=属性，导致该元素样式异常，影响整体布局对齐。修正后代码：

<div class="col-lg-4 portfolio-item filter-wc">
  <img src="https://via.placeholder.com/300x100" class="img-fluid" alt="">
  <div class="portfolio-info">
    <h4>22 Nov</h4>
  </div>
</div>

2. 强制最后一行元素居中 #

如果修复语法后仍存在问题，可通过以下两种方式处理：

• 添加自定义CSS：

.row.justify-content-center .col-lg-4:last-child {
  margin-left: auto;
  margin-right: auto;
}

• 使用Bootstrap内置类：给最后一个元素添加mx-auto类，利用Bootstrap的margin自动居中特性：

<div class="col-lg-4 portfolio-item filter-wc mx-auto">
  <img src="https://via.placeholder.com/300x100" class="img-fluid" alt="">
  <div class="portfolio-info">
    <h4>24 Nov</h4>
  </div>
</div>

3. 排查容器宽度限制 #

确认.container未设置额外的宽度限制，确保Row能充分利用容器空间完成居中对齐。

内容的提问来源于stack exchange，提问作者Ashley