HTML、CSS : Cannot reposition my dropdown list

Question

我正在尝试建立一个网站。但出于某种原因，我无法重新定位我的下拉列表 (CSS)。需要一些帮助。我需要将该下拉列表移至中心。

HTML代码:

    <header>
        <h1 id="my_cycle_head">MY CYCLE</h1>
        <ul id="main_navbar">
            <li>
                <a href="#" style="margin-left: -40px; z-index: -1">Home</a>
            </li>
            <li class="dropdown">
                <a class="dropbtn" style="margin-left: -40px; z-index: -1">Rent</a>
                <div class="dropdown-content">
                    <a href="#">Mountain Bikes</a>
                    <a href="#">Hybrid Bikes</a>
                    <a href="#">Road Bikes</a>
                    <a href="#">City Bikes</a>
                </div>
            </li>
            <li>
                <a href="faq.html" style="margin-left: -40px; z-index: -1">FAQ's</a>
            </li>
            <li>
                <a href="about.html" style="margin-left: -40px; z-index: -1">About</a>
            </li>
        </ul>
    </header>

CSS 代码:

body {
  font-family: 'Open-sans', sans-serif, Helvetica;
  background-color: #f9f9f9;
  text-align: center;
  box-sizing: border-box;
}

.dropdown {
  position: relative;
}

.dropdown-content {
  display: none;
  min-width: 200px;
  right: 1;
  position: absolute;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
}

.dropdown-content a {
  display: block;
}

.dropdown:hover .dropdown-content {
  display: block;
  background-color: #6ab47b;
}

#my_cycle_head {
  text-align: center;
  float: left;
  margin-left: 50px;
  font-weight: normal;
}

#main_navbar {
  text-align: center;
  margin: 0 auto;
  float: right;
  margin-top: 25px;
}

#main_navbar li {
  list-style-type: none;
  display: inline-block;
  min-width: 5em;
}

#main_navbar li a {
  text-decoration: none;
  color: white;
  font-size: 1.2em;
  font-weight: normal;
  text-align: center;
  overflow: hidden;
}

header {
  background-color: #6ab47b;
  height: 95px;
  width: 100%;
  float: left;
  padding-right: 30px;
  margin-left: -20px;
  margin-top: -20px;
  padding-top: 20px;
  color: white;
}

提前谢谢你。

Answer 1

您可以让菜单向右浮动。为了使您的下拉菜单居中，您应该执行以下操作

• 删除"margin-left: -40px;来自所有 <a> 的内联样式元素。
• 将以下两行插入您的 .dropdown-content类

right: 50%;

transform: translate(50%,0);